JEE Main & Advanced Physics Question Bank

done Prism Theory and Dispersion of Light Total Questions - 151

• question_answer1)
  Which source is associated with a line emission spectrum [MP PET/PMT 1988; CBSE PMT 1993]
  A)
             Electric fire                             done clear
  B)
             Neon street sign done clear
  C)
             Red traffic light                    done clear
  D)
             Sun done clear
  View Solution play_arrow

• question_answer2)
  Formula for dispersive power is (where symbols have their usual meanings)                       [MP PMT/PET 1988] or If the refractive indices of crown glass for red, yellow and violet colours are respectively \[{{\mu }_{r\,}},\,\,{{\mu }_{y}}\] and \[{{\mu }_{v}}\], then the dispersive power of this glass would be   [MP PMT 1996]
  A)
             \[\frac{{{\mu }_{v}}-{{\mu }_{y}}}{{{\mu }_{r}}-1}\]              done clear
  B)
             \[\frac{{{\mu }_{v}}-{{\mu }_{r}}}{{{\mu }_{y}}-1}\] done clear
  C)
             \[\frac{{{\mu }_{v}}-{{\mu }_{y}}}{{{\mu }_{y}}-{{\mu }_{r}}}\]        done clear
  D)
   \[\frac{{{\mu }_{v}}-{{\mu }_{r}}}{{{\mu }_{y}}}-1\] done clear
  View Solution play_arrow

• question_answer3)
  The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface, then                                                            [MP PMT 1986]
  A)
             After deviation it will emerge from the second refracting surface done clear
  B)
             It is totally reflected on the second surface and emerges out perpendicularly from third surface in air done clear
  C)
             It is totally reflected from the second and third refracting surfaces and finally emerges out from the first surface done clear
  D)
             It is totally reflected from all the three sides of prism and never emerges out done clear
  View Solution play_arrow

• question_answer4)
  When white light passes through a glass prism, one gets spectrum on the other side of the prism. In the emergent beam, the ray which is deviating least is or Deviation by a prism is lowest for                     [MP PMT 1997]
  A)
             Violet ray                                done clear
  B)
             Green ray done clear
  C)
             Red ray                                    done clear
  D)
             Yellow ray done clear
  View Solution play_arrow

• question_answer5)
  We use flint glass prism to disperse polychromatic light because light of different colours [MP PET 1993]
  A)
             Travel with same speed done clear
  B)
             Travel with same speed but deviate differently due to the shape of the prism done clear
  C)
             Have different anisotropic properties while travelling through the prism done clear
  D)
             Travel with different speeds done clear
  View Solution play_arrow

• question_answer6)
  A prism \[(\mu =1.5)\] has the refracting angle of 30°. The deviation of a monochromatic ray incident normally on its one surface will be (sin 48° 36? = 0.75) [MP PMT/PET 1988]
  A)
             18° 36?                                      done clear
  B)
             20° 30? done clear
  C)
             18° done clear
  D)
             22°1? done clear
  View Solution play_arrow

• question_answer7)
  Fraunhofer lines are obtained in [CPMT 1973; MP PMT 1989; MP PMT 2004]
  A)
             Solar spectrum                     done clear
  B)
             The spectrum obtained from neon lamp done clear
  C)
             Spectrum from a discharge tube done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer8)
  When light rays are incident on a prism at an angle of 45°, the minimum deviation is obtained. If refractive index of the material of prism is \[\sqrt{2}\], then the angle of prism will be [MP PMT 1986]
  A)
             30° done clear
  B)
             40° done clear
  C)
             50° done clear
  D)
             60° done clear
  View Solution play_arrow

• question_answer9)
  A spectrum is formed by a prism of dispersive power \['\omega '\]. If the angle of deviation is \['\delta '\], then the angular dispersion is                                     [MP PMT 1989]
  A)
             \[\omega /\delta \]           done clear
  B)
             \[\delta /\omega \] done clear
  C)
             1/\[\omega \delta \]         done clear
  D)
             \[\omega \delta \] done clear
  View Solution play_arrow

• question_answer10)
  Light from sodium lamp is passed through cold sodium vapours, the spectrum of transmitted light consists of [MP PET 1989; RPMT 2001]
  A)
             A line at 5890 Å                    done clear
  B)
             A line at 5896 Å done clear
  C)
             Sodium doublet lines        done clear
  D)
             No spectral features done clear
  View Solution play_arrow

• question_answer11)
  Angle of minimum deviation for a prism of refractive index 1.5 is equal to the angle of prism. The angle of prism is (cos 41° = 0.75)                                                            [MP PET/PMT 1988]
  A)
             62° done clear
  B)
             41° done clear
  C)
             82° done clear
  D)
             31° done clear
  View Solution play_arrow

• question_answer12)
  In the formation of primary rainbow, the sunlight rays emerge at minimum deviation from rain-drop after [MP PET 1989]
  A)
             One internal reflection and one refraction done clear
  B)
             One internal reflection and two refractions done clear
  C)
             Two internal reflections and one refraction done clear
  D)
             Two internal reflections and two refractions done clear
  View Solution play_arrow

• question_answer13)
  Dispersive power depends upon                           [RPMT 1997]
  A)
             The shape of prism            done clear
  B)
             Material of prism done clear
  C)
             Angle of prism                      done clear
  D)
             Height of the prism done clear
  View Solution play_arrow

• question_answer14)
  When white light passes through the achromatic combination of prisms, then what is observed [MP PMT 1989]
  A)
             Only deviation                      done clear
  B)
             Only dispersion done clear
  C)
             Deviation and dispersion done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer15)
  The dispersion for a medium of wavelength l is D, then the dispersion for the wavelength 2l will be [MP PET 1989]
  A)
             D/8                                            done clear
  B)
             D/4 done clear
  C)
             D/2                                            done clear
  D)
             D done clear
  View Solution play_arrow

• question_answer16)
  The refractive index of a prism for a monochromatic wave is \[\sqrt{2}\] and its refracting angle is 60°. For minimum deviation, the angle of incidence will be [MNR 1998; MP PMT 1989, 92, 2002; CPMT 1993, 2004]
  A)
             30° done clear
  B)
             45° done clear
  C)
             60° done clear
  D)
             75° done clear
  View Solution play_arrow

• question_answer17)
  The ratio of angle of minimum deviation of a prism in air and when dipped in  water will be (\[_{a}{{\mu }_{g}}=3/2\] and \[_{a}{{\mu }_{w}}=4/3\])
  A)
             1/8 done clear
  B)
             1/2 done clear
  C)
             3/4 done clear
  D)
             1/4 done clear
  View Solution play_arrow

• question_answer18)
  The respective angles of the flint and crown glass prisms are A? and A. They are to be used for dispersion without deviation, then the ratio of their angles A' /A will be [MP PMT 1989]
  A)
             \[-\frac{({{\mu }_{y}}-1)}{({{\mu }_{y}}'-1)}\]            done clear
  B)
             \[\frac{({{\mu }_{y}}'-1)}{({{\mu }_{y}}-1)}\] done clear
  C)
             \[({{\mu }_{y}}'-1)\]           done clear
  D)
             \[({{\mu }_{y}}-1)\] done clear
  View Solution play_arrow

• question_answer19)
  The number of wavelengths in the visible spectrum [MP PMT 1989]
  A)
             4000                                          done clear
  B)
             6000 done clear
  C)
             2000                                          done clear
  D)
             Infinite done clear
  View Solution play_arrow

• question_answer20)
  The black lines in the solar spectrum during solar eclipse can be explained by                                      [MP PMT 1989]
  A)
             Planck's law                           done clear
  B)
             Kirchoff's law done clear
  C)
             Boltzmann's law                  done clear
  D)
             Solar disturbances done clear
  View Solution play_arrow

• question_answer21)
  The dispersive power is maximum for the material
  A)
             Flint glass                                done clear
  B)
             Crown glass done clear
  C)
             Mixture of both                   done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer22)
  A light ray is incident by grazing one of the face of a prism and after refraction ray does not emerge out, what should be the angle of prism while critical angle is C
  A)
             Equal to 2C                             done clear
  B)
             Less than 2C done clear
  C)
             More than 2C                       done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer23)
  A parallel beam of monochromatic light is incident at one surface of a equilateral prism. Angle of incidence is 55° and angle of emergence is 46°. The angle of minimum deviation will be                                      [DPMT 1999]
  A)
             Less than 41°                         done clear
  B)
             Equal to 41° done clear
  C)
             More than 41°                      done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer24)
  The spectrum of light emitted by a glowing solid is
  A)
             Continuous spectrum       done clear
  B)
             Line spectrum done clear
  C)
             Band spectrum                    done clear
  D)
             Absorption spectrum done clear
  View Solution play_arrow

• question_answer25)
  Light rays from a source are incident on a glass prism of index of refraction \[\mu \] and angle of prism \[\alpha \]. At near normal incidence, the angle of deviation of the emerging rays is [MP PMT 1993]
  A)
             \[(\mu -2)\alpha \]             done clear
  B)
             \[(\mu -1)\alpha \] done clear
  C)
             \[(\mu +1)\alpha \]            done clear
  D)
             \[(\mu +2)\,\alpha \] done clear
  View Solution play_arrow

• question_answer26)
  Which of the following element was discovered by study of Fraunhofer lines
  A)
             Hydrogen                               done clear
  B)
             Oxygen done clear
  C)
             Helium                                     done clear
  D)
             Ozone done clear
  View Solution play_arrow

• question_answer27)
  By placing the prism in minimum deviation position, images of the spectrum
  A)
             Becomes inverted              done clear
  B)
             Becomes broader done clear
  C)
             Becomes distinct                 done clear
  D)
             Becomes intensive done clear
  View Solution play_arrow

• question_answer28)
  Our eye is most sensitive for which of the following wavelength
  A)
             \[4500\,\,{\AA}\] done clear
  B)
             \[5500\,\,{\AA}\] done clear
  C)
             \[6500\,\,{\AA}\] done clear
  D)
             Equally sensitive for all wave lengths of visible spectrum done clear
  View Solution play_arrow

• question_answer29)
  Three prisms of crown glass, each have angle of prism 9° and two prisms of flint glass are used to make direct vision spectroscope. What will be the angle of flint glass prisms if \[\mu \] for flint is 1.60 and \[\mu \] for crown glass is 1.53
  A)
             11.9°                                         done clear
  B)
             16.0° done clear
  C)
             15.3°                                         done clear
  D)
             9.11° done clear
  View Solution play_arrow

• question_answer30)
  If the refractive indices of crown glass for red, yellow and violet colours are 1.5140, 1.5170 and 1.5318 respectively and for flint glass these are 1.6434, 1.6499 and 1.6852 respectively, then the dispersive powers for crown and flint glass are respectively                                                         [MP PET/PMT 1988]
  A)
             0.034 and 0.064                    done clear
  B)
             0.064 and 0.034 done clear
  C)
             1.00 and 0.064                      done clear
  D)
             0.034 and 1.0 done clear
  View Solution play_arrow

• question_answer31)
  The minimum temperature of a body at which it emits light is
  A)
             1200°C                                     done clear
  B)
             1000°C done clear
  C)
             500°C                                        done clear
  D)
             200°C done clear
  View Solution play_arrow

• question_answer32)
  Band spectrum is obtained when the source emitting light is in the form of    or Band spectrum is characteristic of [CPMT 1988; MP PET 1994; DCE 2004; MP PET 2005]
  A)
             Atoms                                      done clear
  B)
             Molecules done clear
  C)
             Plasma                                     done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer33)
  Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these for mean rays are 1.602 and 1.500 respectively. Angle of prism of flint prism is 10°, then the angle of prism for crown prism will be                                                                 [DPMT 2001]
  A)
             12°2.4'                                      done clear
  B)
             12°4? done clear
  C)
             1.24°                                         done clear
  D)
             12° done clear
  View Solution play_arrow

• question_answer34)
  The angle of minimum deviation for a prism is 40° and the angle of the prism is 60°. The angle of incidence in this position will be      [EAMCET (Engg.) 1995; MH CET 1999; CPMT 2000]
  A)
             30° done clear
  B)
             60° done clear
  C)
             50° done clear
  D)
             100° done clear
  View Solution play_arrow

• question_answer35)
  In the position of minimum deviation when a ray of yellow light passes through the prism, then its angle of incidence is [MP PMT 1989; RPMT 1997]
  A)
             Less than the emergent angle done clear
  B)
             Greater than the emergent angle done clear
  C)
             Sum of angle of incidence and emergent angle is 90° done clear
  D)
             Equal to the emergent angle done clear
  View Solution play_arrow

• question_answer36)
  A circular disc of which 2/3 part is coated with yellow and 1/3 part is with blue. It is rotated about its central axis with high velocity, then it will be seen as
  A)
             Green                                      done clear
  B)
             Brown done clear
  C)
             White                                       done clear
  D)
             Violet done clear
  View Solution play_arrow

• question_answer37)
  The fine powder of a coloured glass is seen as
  A)
             Coloured                                done clear
  B)
             White done clear
  C)
             That of the glass colour    done clear
  D)
             Black done clear
  View Solution play_arrow

• question_answer38)
  When a white light passes through a hollow prism, then [MP PMT 1987]
  A)
             There is no dispersion and no deviation done clear
  B)
             Dispersion but no deviation done clear
  C)
             Deviation but no dispersion done clear
  D)
             There is dispersion and deviation both done clear
  View Solution play_arrow

• question_answer39)
  The light ray is incidence at angle of 60° on a prism of angle 45°. When the light ray falls on the other surface at 90°, the refractive index of the material of prism  \[\mu \] and the angle of deviation \[\delta \] are given by       [DPMT 2001]
  A)
             \[\mu =\sqrt{2}\,,\,\delta ={{30}^{o}}\]                       done clear
  B)
             \[\mu =1.5\,,\,\delta ={{15}^{o}}\] done clear
  C)
             \[\mu =\frac{\sqrt{3}}{2},\delta ={{30}^{o}}\]           done clear
  D)
             \[\mu =\sqrt{\frac{3}{2}},\delta ={{15}^{o}}\] done clear
  View Solution play_arrow

• question_answer40)
  In dispersion without deviation
  A)
             The emergent rays of all the colours are parallel to the incident ray done clear
  B)
             Yellow coloured ray is parallel to the incident ray done clear
  C)
             Only red coloured ray is parallel to the incident ray done clear
  D)
             All the rays are parallel, but not parallel to the incident ray done clear
  View Solution play_arrow

• question_answer41)
  Deviation of 5° is observed from a prism whose angle is small and whose refractive index is 1.5. The angle of prism is                         [MP PET 1990; Similar to Pb. PMT 2003]
  A)
             7.5°                                           done clear
  B)
             10° done clear
  C)
             5°    done clear
  D)
             3.3° done clear
  View Solution play_arrow

• question_answer42)
  The refractive indices of violet and red light are 1.54 and 1.52 respectively. If the angle of prism is 10°, then the angular dispersion is                                                                [MP PMT 1990]
  A)
             0.02                                           done clear
  B)
             0.2 done clear
  C)
             3.06                                           done clear
  D)
             30.6 done clear
  View Solution play_arrow

• question_answer43)
  The angle of minimum deviation measured with a prism is 30° and the angle of prism is 60°. The refractive index of prism material is                                                                [MP PET 1990, 92]
  A)
             \[\sqrt{2}\]                            done clear
  B)
             2 done clear
  C)
             3/2 done clear
  D)
             4/3 done clear
  View Solution play_arrow

• question_answer44)
  If the refractive indices of a prism for red, yellow and violet colours be 1.61, 1.63 and 1.65 respectively, then the dispersive power of the prism will be  [MP PET 1991; DPMT 1999]
  A)
             \[\frac{1.65-1.62}{1.61-1}\]    done clear
  B)
             \[\frac{1.62-1.61}{1.65-1}\] done clear
  C)
             \[\frac{1.65-1.61}{1.63-1}\]    done clear
  D)
             \[\frac{1.65-1.63}{1.61-1}\] done clear
  View Solution play_arrow

• question_answer45)
  The minimum deviation produced by a hollow prism filled with a certain liquid is found to be 30°. The light ray is also found to be refracted at angle of 30°. The refractive index of the liquid is                                           [MP PET 1991]
  A)
             \[\sqrt{2}\]                            done clear
  B)
             \[\sqrt{3}\] done clear
  C)
             \[\sqrt{\frac{3}{2}}\]         done clear
  D)
             \[\frac{3}{2}\] done clear
  View Solution play_arrow

• question_answer46)
  Minimum deviation is observed with a prism having angle of prism A, angle of deviation \[\delta \], angle of incidence i and angle of emergence e. We then have generally [MP PET 1991]
  A)
             i > e                                           done clear
  B)
             i < e done clear
  C)
             i = e                                           done clear
  D)
             i = e = \[\delta \] done clear
  View Solution play_arrow

• question_answer47)
  A thin prism P1 with angle 4° and made from glass of refractive index 1.54 is combined with another thin prism P2 made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of prism P2 is           [MP PMT 1991, 92; IIT-JEE 1990; MP PET 1995, 99; UPSEAT 2001; RPMT 2004]
  A)
             2.6°                                           done clear
  B)
             3° done clear
  C)
             4°    done clear
  D)
             5.33° done clear
  View Solution play_arrow

• question_answer48)
  An achromatic prism is made by combining two prisms \[{{P}_{1}}({{\mu }_{v}}=1.523,\,{{\mu }_{r}}=1.515)\] and \[{{P}_{2}}({{\mu }_{v}}=1.666,\,{{\mu }_{r}}=1.650)\]; where \[\mu \] represents the refractive index. If the angle of the prism \[{{P}_{1}}\] is 10°,  then the angle of the prism P2 will be [MP PMT 1991]
  A)
             5°    done clear
  B)
             7.8° done clear
  C)
             10.6°                                         done clear
  D)
             20° done clear
  View Solution play_arrow

• question_answer49)
  Angle of a prism is 30° and its refractive index is \[\sqrt{2}\] and one of the surface is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path [MP PMT 1991; UPSEAT 2001; CBSE PMT 2004]
  A)
             30° done clear
  B)
             60° done clear
  C)
             45° done clear
  D)
             \[{{\sin }^{-1}}\sqrt{1.5}\] done clear
  View Solution play_arrow

• question_answer50)
  For a material, the refractive indices for red, violet and yellow colour light are respectively 1.52, 1.64 and 1.60. The dispersive power of the material is                                                          [MP PMT 1991]
  A)
             2     done clear
  B)
             0.45 done clear
  C)
             0.2  done clear
  D)
             0.045 done clear
  View Solution play_arrow

• question_answer51)
  Band spectrum is produced by                                [CPMT 1978]
  A)
             H     done clear
  B)
             He done clear
  C)
             H2   done clear
  D)
             Na done clear
  View Solution play_arrow

• question_answer52)
  The band spectra (characteristic of molecular species) is due to emission of radiation [CPMT 1982, 90]               
  A)
             Gaseous state                      done clear
  B)
             Liquid state done clear
  C)
             Solid state                              done clear
  D)
             All of three states done clear
  View Solution play_arrow

• question_answer53)
  Line spectrum was first of all theoretically explained by
  A)
             Swan                                        done clear
  B)
             Fraunhofer done clear
  C)
             Kirchoff                                   done clear
  D)
             Bohr done clear
  View Solution play_arrow

• question_answer54)
  The spectrum of iodine gas under white light will be
  A)
             Only violet done clear
  B)
             Bright lines done clear
  C)
             Only red lines done clear
  D)
             Some black bands in continuous spectrum done clear
  View Solution play_arrow

• question_answer55)
  Continuous spectrum is not due to
  A)
             Hydrogen flame                  done clear
  B)
             Electric bulb done clear
  C)
             Kerosene oil lamp flame  done clear
  D)
             Candle flame done clear
  View Solution play_arrow

• question_answer56)
  Fraunhofer lines are produced by
  A)
             The element present in the photosphere of sun done clear
  B)
             The elements present in the chromosphere of the sun done clear
  C)
             The vapour of the element present in the chromosphere of the sun done clear
  D)
             The carbon dioxide present in the atmosphere done clear
  View Solution play_arrow

• question_answer57)
  A medium is said to be dispersive, if                 [MP PMT 1990]
  A)
             Light of different wavelengths propagate at different speeds done clear
  B)
             Light of different wavelengths propagate at same speed but has different frequencies done clear
  C)
             Light is gradually bent rather than sharply refracted at an interface between the medium and air done clear
  D)
             Light is never totally internally reflected done clear
  View Solution play_arrow

• question_answer58)
  A ray of light is incident at an angle of 60° on one face of a prism of angle 30°. The ray emerging out of the prism makes an angle of 30° with the incident ray. The emergent ray is  [EAMCET 1990; MP PMT 1990]
  A)
             Normal to the face through which it emerges done clear
  B)
             Inclined at 30° to the face through which it emerges done clear
  C)
             Inclined at 60° to the face through which it emerges done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer59)
  In a thin prism of glass (refractive index 1.5),  which of the following relations between the angle of minimum deviations \[{{\delta }_{m}}\] and angle of refraction \[r\] will be correct  [MP PMT 1990]
  A)
             \[{{\delta }_{m}}=r\]         done clear
  B)
             \[{{\delta }_{m}}=1.5\,r\] done clear
  C)
             \[{{\delta }_{m}}=2r\]       done clear
  D)
             \[{{\delta }_{m}}=\frac{r}{2}\] done clear
  View Solution play_arrow

• question_answer60)
  The figures represent three cases of a ray passing through a prism of angle A. The case corresponding to minimum deviation is                                                                      [CPMT 1989]
  A)
             1     done clear
  B)
             2 done clear
  C)
             3     done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer61)
  Dispersion can take place for                                 [MP PET 1992]
  A)
             Transverse waves only but not for longitudinal waves done clear
  B)
             Longitudinal waves only but not for transverse waves done clear
  C)
             Both transverse and longitudinal waves done clear
  D)
             Neither transverse nor longitudinal waves done clear
  View Solution play_arrow

• question_answer62)
  Emission spectrum of \[C{{O}_{2}}\] gas                                                [MP PET 1992]
  A)
             Is a line spectrum done clear
  B)
             Is a band spectrum done clear
  C)
             Is a continuous spectrum        done clear
  D)
             Does not fall in the visible region done clear
  View Solution play_arrow

• question_answer63)
  A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of the prism. The angle of deviation is          [MNR 1988; MP PMT 1999; Roorkee 2000; UPSEAT 2000; MP PET 2005]
  A)
             45° done clear
  B)
             39° done clear
  C)
             20° done clear
  D)
             30° done clear
  View Solution play_arrow

• question_answer64)
  The true statement is
  A)
             The order of colours in the primary and the secondary rainbows is the same done clear
  B)
             The intensity of colours in the primary and the secondary rainbows is the same done clear
  C)
             The intensity of light in the primary rainbow is greater and the order of colours is the same than the secondary rainbow done clear
  D)
             The intensity of light for different colours in primary rainbow is greater and the order of colours is reverse than the secondary rainbow done clear
  View Solution play_arrow

• question_answer65)
  What will be the colour of sky as seen from the earth, if there were no atmosphere                        [MP PMT 1992]
  A)
             Black                                         done clear
  B)
             Blue done clear
  C)
             Orange                                    done clear
  D)
             Red done clear
  View Solution play_arrow

• question_answer66)
  When light emitted by a white hot solid is passed through a sodium flame, the spectrum of the emergent light will show                   [MP PMT 1992]
  A)
             The \[{{D}_{1}}\] and \[{{D}_{2}}\] bright yellow lines of sodium done clear
  B)
             Two dark lines in the yellow region done clear
  C)
             All colours from violet to red done clear
  D)
             No colours at all  done clear
  View Solution play_arrow

• question_answer67)
  A prism ABC of angle 30° has its face AC silvered. A ray of light incident at an angle of 45° at the face AB retraces its path after refraction at face AB and reflection at face AC. The refractive index of the material of the prism is [MP PMT 1992; EAMCET 2001]
  A)
             1.5 done clear
  B)
             \[\frac{3}{\sqrt{2}}\] done clear
  C)
             \[\sqrt{2}\] done clear
  D)
             \[\frac{4}{3}\] done clear
  View Solution play_arrow

• question_answer68)
  A light ray is incident upon a prism in minimum deviation position and suffers a deviation of 34°.  If the shaded half of the prism is knocked off, the ray will     [MP PMT 1992]
  A)
             Suffer a deviation of 34°  done clear
  B)
             Suffer a deviation of 68° done clear
  C)
             Suffer a deviation of 17°  done clear
  D)
             Not come out of the prism done clear
  View Solution play_arrow

• question_answer69)
  A ray of monochromatic light is incident on one refracting face of a prism of angle 75°. It passes through the prism and is incident on the other face at the critical angle. If the refractive index of the material of the prism is \[\sqrt{2}\], the angle of incidence on the first face of the prism is [EAMCET 1983]
  A)
             30° done clear
  B)
             45° done clear
  C)
             60° done clear
  D)
             0° done clear
  View Solution play_arrow

• question_answer70)
  Three glass prisms A, B and C of same refractive index are placed in contact with each other as shown in figure, with no air gap between the prisms. Monochromatic ray of light OP passes through the prism assembly and emerges as QR. The conditions of minimum deviation is satisfied in the prisms [CPMT 1988]
  A)
             A and C done clear
  B)
             B and C done clear
  C)
             A and B done clear
  D)
             In all prisms A, B and C done clear
  View Solution play_arrow

• question_answer71)
  The refractive index of a material of a prism of angles 45°? 45° ? 90° is 1.5. The path of the ray of light incident normally on the hypotenuse side is shown in [EAMCET 1985]
  A)
    done clear
  B)
                 done clear
  C)
                        done clear
  D)
  done clear
  View Solution play_arrow

• question_answer72)
  At the time of total solar eclipse, the spectrum of solar radiation would be           [MP PMT 1990; RPMT 2004]
  A)
             A large number of dark Fraunhofer lines done clear
  B)
             A less number of dark Fraunhofer lines done clear
  C)
             No lines at all done clear
  D)
             All Fraunhofer lines changed into brilliant colours done clear
  View Solution play_arrow

• question_answer73)
  Angle of deviation \[(\delta \]) by a prism (refractive index = \[\mu \] and supposing the angle of prism A to be small) can be given by                                                                  [MP PMT 1994]
  A)
             \[\delta =(\mu -1)\,A\]    done clear
  B)
             \[\delta =(\mu +1)\,A\] done clear
  C)
             \[\delta =\frac{\sin \frac{A+\delta }{2}}{\sin \frac{A}{2}}\]                done clear
  D)
             \[\delta =\frac{\mu -1}{\mu +1}A\] done clear
  View Solution play_arrow

• question_answer74)
  Angle of prism is A and its one surface is silvered. Light rays falling at an angle of incidence 2A on first surface return back through the same path after suffering reflection at second silvered surface. Refractive index of the material of prism is                                                               [AIIMS 1995]
  A)
             2 sin A                                      done clear
  B)
             2 cos A done clear
  C)
             \[\frac{1}{2}\cos A\]          done clear
  D)
             \[\tan A\] done clear
  View Solution play_arrow

• question_answer75)
  A ray of light incident normally on an isosceles right angled prism travels as shown in the figure. The least value of the refractive index of the prism must be [Manipal MEE 1995; BHU 2003]
  A)
             \[\sqrt{2}\] done clear
  B)
             \[\sqrt{3}\] done clear
  C)
             1.5 done clear
  D)
             2.0 done clear
  View Solution play_arrow

• question_answer76)
  When seen in green light, the saffron and green portions of our National Flag will appear to be [Manipal MEE 1995]
  A)
             Black done clear
  B)
             Black and green respectively done clear
  C)
             Green done clear
  D)
             Green and yellow respectively done clear
  View Solution play_arrow

• question_answer77)
  At sun rise or sunset, the sun looks more red than at mid-day because [AFMC 1995; Similar to DCE 2003]
  A)
             The sun is hottest at these times done clear
  B)
             Of the scattering of light done clear
  C)
             Of the effects of refraction done clear
  D)
             Of the effects of diffraction done clear
  View Solution play_arrow

• question_answer78)
  Line spectrum contains information about      [MP PET 1995]
  A)
             The atoms of the prism done clear
  B)
             The atoms of the source done clear
  C)
             The molecules of the source done clear
  D)
             The atoms as well as molecules of the source done clear
  View Solution play_arrow

• question_answer79)
  Missing lines in a continuous spectrum reveal  [MP PET 1995]
  A)
             Defects of the observing instrument done clear
  B)
             Absence of some elements in the light source done clear
  C)
             Presence in the light source of hot vapours of some elements done clear
  D)
             Presence of cool vapours of some elements around the light source done clear
  View Solution play_arrow

• question_answer80)
  A source emits light of wavelength 4700Å, 5400 Å and 6500 Å. The light passes through red glass before being tested by a spectrometer. Which wavelength is seen in the spectrum            [MP PMT 1995]
  A)
             \[6500\,\,{\AA}\]                done clear
  B)
             \[5400\,\,{\AA}\] done clear
  C)
             \[4700\,\,{\AA}\]                done clear
  D)
             All the above done clear
  View Solution play_arrow

• question_answer81)
  A ray passes through a prism of angle 60° in minimum deviation position and suffers a deviation of 30°. What is the angle of incidence on the prism [MP PMT 1995; Pb. PMT 2001; RPMT 2003]
  A)
             30° done clear
  B)
             45° done clear
  C)
             60° done clear
  D)
             90° done clear
  View Solution play_arrow

• question_answer82)
  When light of wavelength \[\lambda \] is incident on an equilateral prism kept in its minimum deviation position, it is found that the angle of deviation equals the angle of the prism itself. The refractive index of the material of the prism for the wavelength \[\lambda \] is, then                                                              [Haryana CEE 1996]
  A)
             \[\sqrt{3}\]                            done clear
  B)
             \[\frac{\sqrt{3}}{2}\] done clear
  C)
             2     done clear
  D)
             \[\sqrt{2}\] done clear
  View Solution play_arrow

• question_answer83)
  Which of the following diagrams, shows correctly the dispersion of white light by a prism [NSEP 1994; MP PET 1996]
  A)
                                                                              done clear
  B)
                    done clear
  C)
                             done clear
  D)
  done clear
  View Solution play_arrow

• question_answer84)
  A neon sign does not produce [MP PET 1996; UPSEAT 2004]
  A)
             Line spectrum done clear
  B)
             An emission spectrum done clear
  C)
             An absorption spectrum done clear
  D)
             Photons done clear
  View Solution play_arrow

• question_answer85)
  The refractive index of flint glass for blue F line is 1.6333 and red C line is 1.6161. If the refractive index for yellow D line is 1.622, the dispersive power of the glass is
  A)
             0.0276                                      done clear
  B)
             0.276 done clear
  C)
             2.76                                           done clear
  D)
             0.106 done clear
  View Solution play_arrow

• question_answer86)
  A triangular prism of glass is shown in the figure. A ray incident normally to one face is totally reflected, if \[\theta ={{45}^{o}}\]. The index of refraction of glass is                                 [AIEEE 2004]
  A)
             Less than 1.41 done clear
  B)
             Equal to 1.41 done clear
  C)
             Greater than 1.41 done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer87)
  The wavelength of emission line spectrum and absorption line spectrum of a substance are related as
  A)
             Absorption has larger value done clear
  B)
             Absorption has smaller value done clear
  C)
             They are equal done clear
  D)
             No relation done clear
  View Solution play_arrow

• question_answer88)
  White light is passed through a prism whose angle is 5°. If the refractive indices for rays of red and blue colour are respectively 1.64 and 1.66, the angle of deviation between the two colours will be                                           [MP PET 1997]
  A)
             0.1 degree                              done clear
  B)
             0.2 degree done clear
  C)
             0.3 degree                              done clear
  D)
             0.4 degree done clear
  View Solution play_arrow

• question_answer89)
  From which source a continuous emission spectrum and a line absorption spectrum are simultaneously obtained [MP PMT 1997]
  A)
             Bunsen burner flame done clear
  B)
             The sun done clear
  C)
             Tube light done clear
  D)
             Hot filament of an electric bulb done clear
  View Solution play_arrow

• question_answer90)
  A thin prism \[{{P}_{1}}\] with angle 6° and made from glass of refractive index 1.54 is combined with another thin prism P2 of refractive index 1.72 to produce dispersion without deviation. The angle of prism  \[{{P}_{2}}\] will be              [MP PMT 1999]
  A)
             5° 24?                                        done clear
  B)
             4° 30? done clear
  C)
             6°    done clear
  D)
             8° done clear
  View Solution play_arrow

• question_answer91)
  If the refractive index of a material of equilateral prism is \[\sqrt{3}\], then angle of minimum deviation of the prism is [CBSE PMT 1999; Pb. PMT 2004; MH CET 2004]
  A)
             30° done clear
  B)
             45° done clear
  C)
             60° done clear
  D)
             75° done clear
  View Solution play_arrow

• question_answer92)
  The splitting of white light into several colours on passing through a glass prism is due to                               [CPMT 1999]
  A)
             Refraction                              done clear
  B)
             Reflection done clear
  C)
             Interference                         done clear
  D)
             Diffraction done clear
  View Solution play_arrow

• question_answer93)
  A white screen illuminated by green and red light appears to be                                                 [KCET 1994; RPMT 1997]
  A)
             Green                                      done clear
  B)
             Red done clear
  C)
             Yellow                                      done clear
  D)
             White done clear
  View Solution play_arrow

• question_answer94)
  Dark lines on solar spectrum are due to  [EAMCET (Engg.) 1995]
  A)
             Lack of certain elements done clear
  B)
             Black body radiation done clear
  C)
             Absorption of certain wavelengths by outer layers done clear
  D)
             Scattering done clear
  View Solution play_arrow

• question_answer95)
  Line spectra are due to                        [EAMCET (Med.) 1995]
  A)
             Hot solids                               done clear
  B)
             Atoms in gaseous state done clear
  C)
             Molecules in gaseous state    done clear
  D)
             Liquid at low temperature done clear
  View Solution play_arrow

• question_answer96)
  The path of a refracted ray of light in a prism is parallel to the base of the prism only when the   [SCRA 1994]
  A)
             Light is of a particular wavelength done clear
  B)
             Ray is incident normally at one face done clear
  C)
             Ray undergoes minimum deviation done clear
  D)
             Prism is made of a particular type of glass done clear
  View Solution play_arrow

• question_answer97)
  For a medium, refractive indices for violet, red and yellow are 1.62, 1.52 and 1.55 respectively, then dispersive power of medium will be                                                                [RPET 1997]
  A)
             0.65                                           done clear
  B)
             0.22 done clear
  C)
             0.18                                           done clear
  D)
             0.02 done clear
  View Solution play_arrow

• question_answer98)
  Two lenses having \[{{f}_{1}}:{{f}_{2}}=2:3\] has combination to make no dispersion. Find the ratio of dispersive power of glasses used                                                                    [RPMT 1997]
  A)
             2 :  3                                          done clear
  B)
             3 : 2 done clear
  C)
             4 : 9                                           done clear
  D)
             9 : 4 done clear
  View Solution play_arrow

• question_answer99)
  If refractive index of red, violet and yellow lights are 1.42, 1.62 and 1.50 respectively for a medium. Its dispersive power will be                                                                 [RPMT 1997]
  A)
             0.4  done clear
  B)
             0.3 done clear
  C)
             0.2  done clear
  D)
             0.1 done clear
  View Solution play_arrow

• question_answer100)
  A ray is incident at an angle of incidence i on one surface of a prism of small angle A and emerges normally from the opposite surface. If the refractive index of the material of the prism is \[\mu \], the angle of incidence i is nearly equal to [CBSE PMT 1992]
  A)
             A /\[\mu \]                            done clear
  B)
             \[A/2\mu \] done clear
  C)
             \[\mu A\]                               done clear
  D)
             \[\mu A/2\] done clear
  View Solution play_arrow

• question_answer101)
  Fraunhofer spectrum is a                 [KCET 1993, 94; RPET 1997;  MP PET 1997, 2001; JIPMER 2000; AIIMS 2001]
  A)
             Line absorption spectrum       done clear
  B)
             Band absorption spectrum done clear
  C)
             Line emission spectrum done clear
  D)
             Band emission spectrum done clear
  View Solution play_arrow

• question_answer102)
  The angle of a prism is 60° and its refractive index is \[\sqrt{2}\]. The angle of minimum deviation suffered by a ray of light in passing through it is                                              [MP PET 2003]
  A)
             About 20°                               done clear
  B)
             30° done clear
  C)
             60° done clear
  D)
             45° done clear
  View Solution play_arrow

• question_answer103)
  Colour of the sky is blue due to [CPMT 1996, 99; AFMC 1993; AIIMS 1999;  AIEEE 2002; BCECE 2003; BHU 2004]
  A)
             Scattering of light                done clear
  B)
             Total internal reflection done clear
  C)
             Total emission                      done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer104)
  Which of the following spectrum have all the frequencies from high to low frequency range [CPMT 1996]
  A)
             Band spectrum                    done clear
  B)
             Continuous spectrum done clear
  C)
             Line spectrum                      done clear
  D)
             Discontinuous spectrum done clear
  View Solution play_arrow

• question_answer105)
  Stars are not visible in the day time because  [JIPMER 1997]
  A)
             Stars hide behind the sun done clear
  B)
             Stars do not reflect sun rays during day done clear
  C)
             Stars vanish during the day done clear
  D)
             Atmosphere scatters sunlight into a blanket of extreme brightness through which faint stars cannot be visible done clear
  View Solution play_arrow

• question_answer106)
  Which of the following colours suffers maximum deviation in a prism                      [KCET 1998; DPMT 2000]
  A)
           Yellow                           done clear
  B)
           Blue done clear
  C)
             Green                                      done clear
  D)
             Orange done clear
  View Solution play_arrow

• question_answer107)
  If a thin prism of glass is dipped into water then minimum deviation (with respect to air) of light produced by prism will be left  \[\left( _{a}{{\mu }_{g}}=\frac{3}{2}\text{ and}{{\,}_{a}}{{\mu }_{w}}\,=\,\frac{4}{3} \right)\]                            [UPSEAT 1999]
  A)
             \[\frac{1}{2}\]                       done clear
  B)
             \[\frac{1}{4}\] done clear
  C)
              2    done clear
  D)
             \[\frac{1}{5}\] done clear
  View Solution play_arrow

• question_answer108)
  The refractive indices for the light of violet and red colours of any material are 1.66 and 1.64 respectively.  If the angle of prism made of this material is 10o, then angular dispersion will  be                                            [UPSEAT 1999]
  A)
             0.20o                                         done clear
  B)
             0.10o done clear
  C)
             0.40o                                         done clear
  D)
             1o done clear
  View Solution play_arrow

• question_answer109)
  The refractive index of the material of the prism for violet colour is 1.69 and that for red is 1.65.  If the refractive index for mean colour is 1.66, the dispersive power of the material of the prism                                   [JIPMER 1999]
  A)
             0.66                                           done clear
  B)
             0.06 done clear
  C)
             0.65                                           done clear
  D)
             0.69 done clear
  View Solution play_arrow

• question_answer110)
  The deviation caused in red, yellow and violet colours for crown glass prism are 2.84o, 3.28o and 3.72o respectively.  The dispersive power of prism material is  [KCET (Engg.) 1999]
  A)
             0.268                                        done clear
  B)
             0.368 done clear
  C)
             0.468                                        done clear
  D)
             0.568 done clear
  View Solution play_arrow

• question_answer111)
  Dispersion of light is due to                                          [DCE 1999]
  A)
             Wavelength                          done clear
  B)
             Intensity of light done clear
  C)
             Density of medium            done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer112)
  A prism of refracting angle 60o is made with a material of refractive index m.  For a certain wavelength of light, the angle of minimum deviation is 30o. For this, wavelength the value of refractive index of the material is [CPMT 1999, MH CET 2000]
  A)
             1.231                                        done clear
  B)
             1.820 done clear
  C)
             1.503                                        done clear
  D)
             1.414 done clear
  View Solution play_arrow

• question_answer113)
  Which of the prism is used to see infrared spectrum of light [RPMT 2000]
  A)
             Rock Salt                                 done clear
  B)
             Nicol done clear
  C)
             Flint                                          done clear
  D)
             Crown done clear
  View Solution play_arrow

• question_answer114)
  When white light enters a prism, it gets split into its constituent colours.  This is due to             [DCE 2000]
  A)
             High density of prism material                                          done clear
  B)
             Because m is different for different l done clear
  C)
             Diffraction of light               done clear
  D)
             Velocity changes for different frequencies done clear
  View Solution play_arrow

• question_answer115)
  The dispersive powers of crown and flint glasses are 0.02 and 0.04 respectively.  In an achromatic combination of lenses the focal length of flint glass lens is 40 cm.  The focal length of crown glass lens will be                             [DCE 2000]
  A)
             ? 20 cm                                    done clear
  B)
             + 20 cm done clear
  C)
             ? 10 cm                                    done clear
  D)
             + 10 cm done clear
  View Solution play_arrow

• question_answer116)
  When a ray of light is incident normally on one refracting surface of an equilateral prism (Refractive index of the material of the prism = 1.5                                  [EAMCET (Med.) 2000]
  A)
             Emerging ray is deviated by 30o done clear
  B)
             Emerging ray is deviated by 45o done clear
  C)
             Emerging ray just grazes the second refracting surface       done clear
  D)
             The ray undergoes total internal reflection at the second refracting surface done clear
  View Solution play_arrow

• question_answer117)
  Consider the following two statements A and B and identify the correct choice in the given answers                                                                                                     [EAMCET (Engg.) 2000] A :      Line spectra is due to atoms in gaseous state B :  Band spectra is due to molecules
  A)
             Both A and B are false done clear
  B)
             A is true and B is false done clear
  C)
             A is false and B is true       done clear
  D)
             Both A and B are true done clear
  View Solution play_arrow

• question_answer118)
  Under minimum deviation condition in a prism, if a ray is incident at an angle 30o, the angle between the emergent ray and the second refracting surface of the prism is [EAMCET (Engg.) 2000]
  A)
             0o    done clear
  B)
             30 o done clear
  C)
             45 o done clear
  D)
             60 o done clear
  View Solution play_arrow

• question_answer119)
  The angle of prism is 5o and its refractive indices for red and violet colours are 1.5 and 1.6 respectively.  The angular dispersion produced by the prism is                 [MP PMT 2000]
  A)
             7.75o                                         done clear
  B)
             5 o done clear
  C)
             0.5 o                                           done clear
  D)
             0.17 o done clear
  View Solution play_arrow

• question_answer120)
  If the refractive angles of two prisms made of crown glass are 10o and 20o respectively, then  the ratio of their colour deviation powers will be             [KCET 1999; AFMC 2001]
  A)
             1 : 1                                           done clear
  B)
             2 : 1 done clear
  C)
             4 : 1                                           done clear
  D)
             1 : 2 done clear
  View Solution play_arrow

• question_answer121)
  The nature of sun?s spectrum is [MP PET 2000; MP PMT 2001]
  A)
             Continuous spectrum with absorption lines done clear
  B)
             Line spectrum done clear
  C)
             The spectrum of the helium atom done clear
  D)
             Band spectrum done clear
  View Solution play_arrow

• question_answer122)
  A ray of light is incident normally on one of the face of a prism of angle 30o and refractive index \[\sqrt{2}\].  The angle of deviation will be                                                                            [KCET 2001]
  A)
             26o                                             done clear
  B)
             0 o done clear
  C)
             23 o done clear
  D)
             15 o done clear
  View Solution play_arrow

• question_answer123)
  For a prism of refractive index 1.732, the angle of minimum deviation is equal to the angle of the prism.  The angle of the prism is                                                       [CBSE PMT 2001]
  A)
             80o                                             done clear
  B)
             70o done clear
  C)
             60o                                             done clear
  D)
             50o done clear
  View Solution play_arrow

• question_answer124)
  The spectrum obtained from an electric lamp or red hot heater is                             [BHU 2001; Pb. PET 2003]
  A)
             Line spectrum                      done clear
  B)
             Band spectrum done clear
  C)
             Absorption spectrum        done clear
  D)
             Continuous spectrum done clear
  View Solution play_arrow

• question_answer125)
  When a glass prism of refracting angle 60o is immersed in a liquid its angle of minimum deviation is 30o. The critical angle of glass with respect to the liquid medium is          [EAMCET 2001]
  A)
             42o                                             done clear
  B)
             45 o done clear
  C)
             50 o done clear
  D)
             52 o done clear
  View Solution play_arrow

• question_answer126)
  Three prisms 1, 2 and 3 have the prism angle A = 60o, but their refractive indices are respectively 1.4, 1.5 and 1.6.  If d1, d2, d3 be their respective angles of deviation then [MP PMT 2001]
  A)
             d3 > d2 > d1                              done clear
  B)
             d1 > d2 > d3 done clear
  C)
             d1 = d2 = d3                              done clear
  D)
             d2 > d1 > d3 done clear
  View Solution play_arrow

• question_answer127)
  Which one of the following alternative is FALSE for a prism placed in a position of minimum deviation [MP PET 2001]
  A)
             i1 = i2                                         done clear
  B)
             r1 = r2 done clear
  C)
             i1 = r1                                        done clear
  D)
             All of these done clear
  View Solution play_arrow

• question_answer128)
  In the visible region the dispersive powers and the mean angular deviations for crown and flint glass prisms are w, w¢ and d, d¢ respectively. The condition for getting deviation without dispersion when the two prisms are combined is [EAMCET 2001]
  A)
             \[\sqrt{\omega d}\,+\,\sqrt{{\omega }'{d}'}=0\]      done clear
  B)
             \[{\omega }'d+\omega {d}'=0\] done clear
  C)
             \[\omega d+{\omega }'{d}'=0\]                                        done clear
  D)
             \[{{(\omega d)}^{2}}+{{({\omega }'{d}')}^{2}}=0\] done clear
  View Solution play_arrow

• question_answer129)
  A ray of light passes through the equilateral prism such that angle of incidence is equal to the angle of emergence if the angle of incidence is 45o.  The angle of deviation will be [Pb. PMT 2002]
  A)
             15o                                             done clear
  B)
             75 o done clear
  C)
             60 o done clear
  D)
             30 o done clear
  View Solution play_arrow

• question_answer130)
  The solar spectrum during a complete solar eclipse is [Kerala PET 2002]
  A)
             Continuous                            done clear
  B)
             Emission line done clear
  C)
             Dark line                                 done clear
  D)
             Dark band done clear
  View Solution play_arrow

• question_answer131)
  Why sun has elliptical shape on the time when rising and sun setting ? It is due to                                             [AFMC 2002]
  A)
             Refraction                              done clear
  B)
             Reflection done clear
  C)
             Scattering                               done clear
  D)
             Dispersion done clear
  View Solution play_arrow

• question_answer132)
  In the formation of a rainbow light from the sun on water droplets undergoes [CBSE PMT 2000; Orissa JEE 2002; MP PET 2003; KCET 2004]
  A)
             Dispersion only done clear
  B)
             Only total internal reflection done clear
  C)
             Dispersion and total internal reflection                         done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer133)
  The Cauchy?s dispersion formula is                       [AIIMS 2002]
  A)
             \[n=A+B{{\lambda }^{-2}}+C{{\lambda }^{-4}}\]       done clear
  B)
             \[n=A+B{{\lambda }^{2}}+C{{\lambda }^{-4}}\] done clear
  C)
             \[n=A+B{{\lambda }^{-2}}+C{{\lambda }^{4}}\]         done clear
  D)
             \[n=A+B{{\lambda }^{2}}+C{{\lambda }^{4}}\] done clear
  View Solution play_arrow

• question_answer134)
  A prism of refractive index m and angle A is placed in the minimum deviation position.  If the angle of minimum deviation is A, then the value of A in terms of m is              [EAMCET 2003]
  A)
             \[{{\sin }^{-1}}\left( \frac{\mu }{2} \right)\]                done clear
  B)
             \[{{\sin }^{-1}}\sqrt{\frac{\mu -1}{2}}\] done clear
  C)
             \[2{{\cos }^{-1}}\left( \frac{\mu }{2} \right)\]             done clear
  D)
   \[{{\cos }^{-1}}\left( \frac{\mu }{2} \right)\]                         done clear
  View Solution play_arrow

• question_answer135)
  A given ray of light suffers minimum deviation in an equilateral prism P. Additional prisms Q and R of identical shape and material are now added to P as shown in the figure.  The ray will suffer   [IIT-JEE (Screening) 2001; KCET 2003]
  A)
             Greater deviation done clear
  B)
             Same deviation done clear
  C)
             No deviation done clear
  D)
             Total internal reflection done clear
  View Solution play_arrow

• question_answer136)
  In the given figure, what is the angle of prism [Orissa JEE 2003]
  A)
             A done clear
  B)
             B done clear
  C)
             C done clear
  D)
             D done clear
  View Solution play_arrow

• question_answer137)
  A prism of refractive index \[\sqrt{2}\] has a refracting angle of 60o.  At what angle a ray must be incident on it so that it suffers a minimum deviation             [BHU 2003; MP PMT 2005]
  A)
             45o done clear
  B)
             60o done clear
  C)
             90o done clear
  D)
             180o done clear
  View Solution play_arrow

• question_answer138)
  A convex lens, a glass slab, a glass prism and a solid sphere all are made of the same glass, the dispersive power will be [CPMT 1986]
  A)
             In the glass slab and prism done clear
  B)
             In the lens and solid sphere done clear
  C)
             Only in prism done clear
  D)
             In all the four done clear
  View Solution play_arrow

• question_answer139)
  A parallel beam of white light falls on a convex lens. Images of blue, yellow and red light are formed on other side of the lens at a distance of 0.20 m, 0.205 m and 0.214 m respectively. The dispersive power of the material of the lens will be                                                                 [MP PMT 1991]
  A)
             619/1000                                 done clear
  B)
             9/200 done clear
  C)
             14/205                                     done clear
  D)
             5/214 done clear
  View Solution play_arrow

• question_answer140)
  The refractive index of the material of the prism for violet colour is 1.69 and that for red is 1.65.  If the refractive index for mean colour is 1.66, the dispersive power of the material of the prism                                   [JIPMER 1999]
  A)
             0.66                                           done clear
  B)
             0.06 done clear
  C)
             0.65                                           done clear
  D)
             0.69 done clear
  View Solution play_arrow

• question_answer141)
  If the angle of prism is  and the angle of minimum deviation is , the angle of refraction will be [MP PMT 2004]
  A)
                                                        done clear
  B)
             done clear
  C)
                                                      done clear
  D)
             done clear
  View Solution play_arrow

• question_answer142)
  The refractive index of a particular material is 1.67 for blue light, 1.65 for yellow light and 1.63 for red light. The dispersive power of the material is.........  [KCET 2004]
  A)
             0.0615                                      done clear
  B)
             0.024 done clear
  C)
             0.031                                        done clear
  D)
             1.60 done clear
  View Solution play_arrow

• question_answer143)
  A ray of light is incident on an equilateral glass prism placed on a horizontal table. For minimum deviation which of the following is true                                          [IIT-JEE (Screening) 2004]
  A)
             PQ is horizontal                    done clear
  B)
             QR is horizontal done clear
  C)
             RS is horizontal                     done clear
  D)
             Either PQ or RS is horizontal done clear
  View Solution play_arrow

• question_answer144)
  A beam of light composed of red and green ray is incident obliquely at a point on the face of rectangular glass slab. When coming out on the opposite parallel face, the red and green ray emerge from                    [CBSE PMT 2004]
  A)
             Two points propagating in two different directions done clear
  B)
             Two points propagating in two parallel directions done clear
  C)
             One point propagating in two different directions done clear
  D)
             One point propagating in the same directions done clear
  View Solution play_arrow

• question_answer145)
  White light is passed through a prism ........... colour shows minimum deviation                  [Orissa PMT 2004]
  A)
             Red                                           done clear
  B)
             Violet done clear
  C)
             Yellow                                      done clear
  D)
             Green done clear
  View Solution play_arrow

• question_answer146)
  A ray of monochromatic light suffers minimum deviation of  while passing through a prism of refracting angle . Refractive index of the prism material is           [Pb. PET 2001]
  A)
             1.5 done clear
  B)
             1.3 done clear
  C)
             0.8  done clear
  D)
             2.4 done clear
  View Solution play_arrow

• question_answer147)
  A ray incident a  on one refracting surface of a prism of angle , suffers a deviation of . What is the angle of emergence                                                                         [DCE 2002]
  A)
                                                        done clear
  B)
             done clear
  C)
                                                        done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer148)
  The spectrum obtained from a sodium vapour lamp is an example of                                      [MH CET 2003]
  A)
             Absorption spectrum        done clear
  B)
             Emission spectrum done clear
  C)
             Continuous spectrum       done clear
  D)
             Band spectrum done clear
  View Solution play_arrow

• question_answer149)
  The sky would appear red instead of blue if         [DCE 2004]
  A)
             Atmospheric particles scatter blue light more than red light done clear
  B)
             Atmospheric particles scatter all colours equally done clear
  C)
             Atmospheric particles scatter red light more than the blue light done clear
  D)
             The sun was much hotter done clear
  View Solution play_arrow

• question_answer150)
  Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation                                                               [CPMT 1983; AFMC 2005]
  A)
             Scattering                                  done clear
  B)
             Diffraction done clear
  C)
             Interference                         done clear
  D)
             Polarisation done clear
  View Solution play_arrow

• question_answer151)
  In absorption spectrum of Na the missing wavelength (s) are     [BCECE 2005]
  A)
             589 nm                                    done clear
  B)
             589.6 nm done clear
  C)
             Both                                         done clear
  D)
             None of these done clear
  View Solution play_arrow