JEE Main & Advanced Physics Wave Optics / तरंग प्रकाशिकी Question Bank

done Polarisation of Light Total Questions - 35

• question_answer1)
  A polariser is used to                                                   [CPMT 1999]
  A)
             Reduce intensity of light  done clear
  B)
             Produce polarised light done clear
  C)
             Increase intensity of light done clear
  D)
             Produce unpolarised light done clear
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• question_answer2)
  Light waves can be polarised as they are [CBSE PMT 1993; KCET 1994; AFMC 1997; J & K CET 2002; CPMT 2005]
  A)
             Transverse                             done clear
  B)
             Of high frequency done clear
  C)
             Longitudinal                          done clear
  D)
             Reflected done clear
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• question_answer3)
  Through which character we can distinguish the light waves from sound waves [CBSE PMT 1990; RPET 2000, 02]
  A)
             Interference                         done clear
  B)
             Refraction done clear
  C)
             Polarisation                           done clear
  D)
             Reflection done clear
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• question_answer4)
  The angle of polarization for any medium is 60o, what will be critical angle for this                                              [UPSEAT 1999]
  A)
             \[{{\sin }^{-1}}\sqrt{3}\]   done clear
  B)
             \[{{\tan }^{-1}}\sqrt{3}\] done clear
  C)
             \[{{\cos }^{-1}}\sqrt{3}\]  done clear
  D)
             \[{{\sin }^{-1}}\frac{1}{\sqrt{3}}\] done clear
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• question_answer5)
  The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refraction index n) is                                                                   [AIEEE 2004; UPSEAT 2005]
  A)
             \[{{\sin }^{-1}}(n)\]            done clear
  B)
             \[{{\sin }^{-1}}\left( \frac{1}{n} \right)\] done clear
  C)
             \[{{\tan }^{-1}}\left( \frac{1}{n} \right)\]                      done clear
  D)
             \[{{\tan }^{-1}}(n)\] done clear
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• question_answer6)
  Which of following  cannot be polarised     [Kerala PMT 2001]
  A)
             Radio waves                          done clear
  B)
             Ultraviolet rays done clear
  C)
             Infrared rays                         done clear
  D)
             Ultrasonic waves done clear
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• question_answer7)
  A polaroid is placed at 45o to an incoming light of intensity \[{{I}_{0}}\]. Now the intensity of light passing through polaroid after polarization would be                                       [CPMT 1995]
  A)
             \[{{I}_{0}}\]                           done clear
  B)
             \[{{I}_{0}}/2\] done clear
  C)
             \[{{I}_{0}}/4\]                       done clear
  D)
             Zero done clear
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• question_answer8)
  Plane polarized light is passed through a polaroid. On viewing through the polaroid we find that when the polaroid is given one complete rotation about the direction of the light, one of the following is observed  [MNR 1993]
  A)
             The intensity of light gradually decreases to zero and remains at zero done clear
  B)
             The intensity of light gradually increases to a maximum and remains at maximum done clear
  C)
             There is no change in intensity done clear
  D)
             The intensity of light is twice maximum and twice zero done clear
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• question_answer9)
  Out of the following statements which is not correct  [CPMT 1991]
  A)
             When unpolarised light passes through a Nicol's prism, the emergent light is elliptically polarized done clear
  B)
             Nicol's prism works on the principle of double refraction and total internal reflection  done clear
  C)
             Nicol's prism can be used to produce and analyze polarized light    done clear
  D)
             Calcite and Quartz are both doubly refracting crystals done clear
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• question_answer10)
  A ray of light is incident on the surface of a glass plate at an angle of incidence equal to Brewster's angle \[\varphi \]. If \[\mu \] represents the refractive index of glass with respect to air, then the angle between reflected and refracted rays is  [CPMT 1989]
  A)
             \[90+\varphi \]                     done clear
  B)
             \[{{\sin }^{-1}}(\mu \cos \varphi )\] done clear
  C)
             90o                                             done clear
  D)
             \[{{90}^{o}}-{{\sin }^{-1}}(\sin \varphi /\mu )\] done clear
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• question_answer11)
  Figure represents a glass plate placed vertically on a horizontal table with a beam of unpolarised light falling on its surface at the polarising angle of 57o with the normal. The electric vector in the reflected light on screen S will vibrate with respect to the plane of incidence in a          [CPMT 1988]
  A)
             Vertical plane done clear
  B)
             Horizontal plane                  done clear
  C)
             Plane making an angle of 45o with the vertical done clear
  D)
             Plane making an angle of 57o with the horizontal done clear
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• question_answer12)
  A beam of light AO is incident on a glass slab \[(\mu =1.54)\] in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that         [CPMT 1986]
  A)
             The intensity is reduced down to zero and remains zero    done clear
  B)
             The intensity reduces down somewhat and rises again       done clear
  C)
             There is no change in intensity done clear
  D)
             The intensity gradually reduces to zero and then again increases done clear
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• question_answer13)
  Polarised glass is used in sun glasses because   [CPMT 1981]
  A)
             It reduces the light intensity to half an account of polarisation done clear
  B)
             It is fashionable done clear
  C)
             It has good colour done clear
  D)
             It is cheaper done clear
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• question_answer14)
  In the propagation of electromagnetic waves the angle between the direction of propagation and plane of polarisation is                                                                                              [CPMT 1978]
  A)
             0o    done clear
  B)
             45o done clear
  C)
             90o done clear
  D)
             180o done clear
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• question_answer15)
  The transverse nature of light is shown by [CPMT 1972, 74, 78; RPMT 1999; AFMC 2001; AIEEE 2002; MP PET 2004; MP PMT 2000, 04; UPSEAT 2005]
  A)
             Interference of light          done clear
  B)
             Refraction of light done clear
  C)
             Polarisation of light            done clear
  D)
             Dispersion of light done clear
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• question_answer16)
  A calcite crystal is placed over a dot on a piece of paper and rotated, on seeing through the calcite one will be see  [CPMT 1971]
  A)
             One dot done clear
  B)
             Two stationary dots done clear
  C)
             Two rotating dots done clear
  D)
             One dot rotating about the other done clear
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• question_answer17)
  A light has amplitude A and angle between analyser and polariser is 60°. Light is reflected by analyser has amplitude       [UPSEAT 2001]
  A)
             \[A\sqrt{2}\]                         done clear
  B)
             \[A/\sqrt{2}\] done clear
  C)
             \[\sqrt{3}A/2\]                     done clear
  D)
             \[A/2\] done clear
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• question_answer18)
  When light is incident on a doubly refracting crystal, two refracted rays-ordinary ray (O-ray) and extra ordinary ray (E-ray) are produced. Then                                                       [KCET 2001]
  A)
             Both O-ray and E-ray are polarised perpendicular to the plane of incidence done clear
  B)
             Both O-ray and E-ray are polarised in the plane of incidence done clear
  C)
             E-ray is polarised perpendicular to the plane of incidence and O-ray in the plane of incidence done clear
  D)
             E-ray is polarised in the plane of incidence and O-ray perpendicular to the plane of incidence done clear
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• question_answer19)
  Light passes successively through two polarimeters tubes each of length 0.29m. The first tube contains dextro rotatory solution of concentration 60kgm?3 and specific rotation 0.01rad m222222222222222222222kg?1. The second tube contains laevo rotatory solution of concentration 30kg/m3 and specific rotation 0.02 radm2kg?1. The net rotation produced is [KCET 2002]
  A)
             15° done clear
  B)
             0° done clear
  C)
             20° done clear
  D)
             10° done clear
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• question_answer20)
  \[{{V}_{o}}\]and \[{{V}_{E}}\]represent the velocities,\[{{\mu }_{o}}\]and\[{{\mu }_{E}}\]the refractive indices of ordinary and extraordinary rays for a doubly refracting crystal. Then                                          [KCET 2002]
  A)
             \[{{V}_{o}}\ge {{V}_{E}},\ \ {{\mu }_{o}}\le {{\mu }_{E}}\]if the crystal is calcite done clear
  B)
             \[{{V}_{o}}\le {{V}_{E}},\ \ {{\mu }_{o}}\le {{\mu }_{E}}\]if the crystal is quartz done clear
  C)
             \[{{V}_{o}}\le {{V}_{E}},\ \ {{\mu }_{o}}\ge {{\mu }_{E}}\]if the crystal is calcite done clear
  D)
             \[{{V}_{o}}\ge {{V}_{E}},\ \ {{\mu }_{o}}\ge {{\mu }_{E}}\]if the crystal is quartz done clear
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• question_answer21)
  Polarising angle for water is 53°4'. If light is incident at this angle on the surface of water and reflected, the angle of refraction is                                                                   [TNPCEE 2002]
  A)
             53°4'                                         done clear
  B)
             126°56' done clear
  C)
             36°56'                                       done clear
  D)
             30°4' done clear
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• question_answer22)
  When a plane polarised light is passed through an analyser and analyser is rotated through 90º, the intensity of the emerging light                                                              [TNPCEE 2002]
  A)
             Varies between a maximum and minimum done clear
  B)
             Becomes zero done clear
  C)
             Does not vary done clear
  D)
             Varies between a maximum and zero done clear
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• question_answer23)
  Consider the following statements A to B  and identify the correct answer A.       Polarised light can be used to study the helical surface of nucleic acids. B.        Optics axis is a direction and not any particular line in the crystal     [EAMCET (Med.) 2003]
  A)
             A and B are correct             done clear
  B)
             A and B are wrong done clear
  C)
             A is correct but B is wrong       done clear
  D)
             A is wrong but B is correct done clear
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• question_answer24)
  Two Nicols are oriented with their principal planes making an angle of 60°. The percentage of incident unpolarized light which passes through the system is 
  A)
             50%                                           done clear
  B)
             100% done clear
  C)
             12.5%                                       done clear
  D)
             37.5% done clear
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• question_answer25)
  Unpolarized light falls on two polarizing sheets placed one on top of the other. What must be the angle between the characteristic directions of the sheets if the intensity of the final transmitted light is one-third the maximum intensity of the first transmitted beam
  A)
             75°                                             done clear
  B)
             55° done clear
  C)
             35° done clear
  D)
             15° done clear
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• question_answer26)
  Unpolarized light of intensity 32Wm?2 passes through three polarizers such that transmission axes of the first and second polarizer makes and angle 30° with each other and the transmission axis of the last polarizer is crossed with that of the first. The intensity of final emerging light will be
  A)
             32 Wm?2                                  done clear
  B)
             3 Wm?2 done clear
  C)
             8 Wm?2                                    done clear
  D)
             4 Wm?2 done clear
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• question_answer27)
  In the visible region of the spectrum the rotation of the place of polarization is given by \[\theta =a+\frac{b}{{{\lambda }^{2}}}\]. The optical rotation produced by a particular material is found to be 30° per mm at \[\lambda =5000\]Å and 50° per mm at \[\lambda =4000\text{{ }\!\!\mathrm{\AA}\!\!\text{ }}\]. The value of constant a will be    
  A)
             \[+\frac{50{}^\circ }{9}\]per mm                                      done clear
  B)
             \[-\frac{50{}^\circ }{9}\]per mm done clear
  C)
             \[+\frac{9{}^\circ }{50}\]per mm                                      done clear
  D)
             \[-\frac{9{}^\circ }{50}\]per mm done clear
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• question_answer28)
  When an unpolarized light of intensity \[{{I}_{0}}\] is incident on a polarizing sheet, the intensity of the light which does not get transmitted is                                                          [AIEEE 2005]
  A)
             Zero                                          done clear
  B)
             \[{{I}_{0}}\] done clear
  C)
             \[\frac{1}{2}{{I}_{0}}\]      done clear
  D)
             \[\frac{1}{4}{{I}_{0}}\] done clear
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• question_answer29)
  Refractive index of material is equal to tangent of polarising angle. It is called                                      [AFMC 2005]
  A)
             Brewster?s law done clear
  B)
             Lambert?s law done clear
  C)
             Malus?s law                           done clear
  D)
             Bragg?s law done clear
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• question_answer30)
  In case of linearly polarised light, the magnitude of the electric field vector:                                         [AIIMS 2005]
  A)
             Does not change with time    done clear
  B)
             Varies periodically with time done clear
  C)
             Increases and decreases linearly with time done clear
  D)
             Is parallel to the direction of propagation done clear
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• question_answer31)
  When unpolarised light beam is incident from air onto glass (n = 1.5) at the polarising angle          [KCET 2005]
  A)
             Reflected beam is polarised 100 percent done clear
  B)
             Reflected and refracted beams are partially polarised done clear
  C)
             The reason for (a) is that almost all the light is reflected      done clear
  D)
             All of the above done clear
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• question_answer32)
  An optically active compound           [DCE 2005]
  A)
             Rotates the plane polarised light done clear
  B)
             Changing the direction of polarised light done clear
  C)
             Do not allow plane polarised light to pass through done clear
  D)
             None of the above done clear
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• question_answer33)
  When the angle of incidence on a material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in ms?1)  [Kerala PMT 2005]
  A)
             \[3\times {{10}^{8}}\]       done clear
  B)
             \[\left( \frac{3}{\sqrt{2}} \right)\times {{10}^{8}}\] done clear
  C)
             \[\sqrt{3}\times {{10}^{8}}\]  done clear
  D)
             \[0.5\times {{10}^{8}}\] done clear
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• question_answer34)
  Two polaroids are placed in the path of unpolarized beam of intensity \[{{I}_{0}}\] such that no light is emitted from the second polaroid. If a third polaroid whose polarization axis makes an angle q with the polarization axis of first polaroid, is placed between these polaroids then the intensity of light emerging from the last polaroid will be           [UPSEAT 2005]
  A)
             \[\left( \frac{{{I}_{0}}}{8} \right){{\sin }^{2}}2\theta \]         done clear
  B)
             \[\left( \frac{{{I}_{0}}}{4} \right){{\sin }^{2}}2\theta \] done clear
  C)
             \[\left( \frac{{{I}_{0}}}{2} \right){{\cos }^{4}}\theta \]          done clear
  D)
             \[{{I}_{0}}{{\cos }^{4}}\theta \] done clear
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• question_answer35)
  For the study of the helical structure of nucleic acids, the property of electromagnetic radiation generally used is [EAMCET 2005]
  A)
             Reflection                              done clear
  B)
             Interference done clear
  C)
             Diffraction                              done clear
  D)
             Polarisation done clear
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