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

done Wave Nature and Interference of Light Total Questions - 72

• question_answer1)
  By corpuscular theory of light, the phenomenon which can be explained is
  A)
             Refraction                              done clear
  B)
             Interference done clear
  C)
             Diffraction                              done clear
  D)
             Polarisation done clear
  View Solution play_arrow

• question_answer2)
  According to corpuscular theory of light, the different colours of light are due to
  A)
             Different electromagnetic waves done clear
  B)
             Different force of attraction among the corpuscles done clear
  C)
             Different size of the corpuscles done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer3)
  Huygen's conception of secondary waves          [CPMT 1975]
  A)
             Allow us to find the focal length of a thick lens done clear
  B)
             Is a geometrical method to find a wavefront done clear
  C)
             Is used to determine the velocity of light done clear
  D)
             Is used to explain polarization done clear
  View Solution play_arrow

• question_answer4)
  The idea of the quantum nature of light has emerged in an attempt to explain                                   [CPMT 1990]
  A)
             Interference done clear
  B)
             Diffraction done clear
  C)
             Radiation spectrum of a black body done clear
  D)
             Polarisation done clear
  View Solution play_arrow

• question_answer5)
  Two coherent sources of light can be obtained by [MH CET 2001]
  A)
             Two different lamps          done clear
  B)
             Two different lamps but of the same power done clear
  C)
             Two different lamps of same power and having the same colour done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer6)
  By Huygen's wave theory of light, we cannot explain the phenomenon of [CPMT 1989; AFMC 1993, 99; MP PET 1995, 2003; RPMT 2003; BCECE 2003; Pb PMT 2004]
  A)
             Interference                         done clear
  B)
             Diffraction done clear
  C)
             Photoelectric effect           done clear
  D)
             Polarisation done clear
  View Solution play_arrow

• question_answer7)
  The phenomenon of interference is shown by [MNR 1994; MP PMT 1997; AIIMS 1999, 2000;  JIPMER 2000; UPSEAT 1994, 2000]
  A)
             Longitudinal mechanical waves only done clear
  B)
             Transverse mechanical waves only done clear
  C)
             Electromagnetic waves only done clear
  D)
             All the above types of waves done clear
  View Solution play_arrow

• question_answer8)
  Two coherent monochromatic light beams of intensities I  and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are [IIT-JEE 1988; RPMT 1995; AIIMS 1997; MP PMT 1997;MP PET 1999; BHU 2002; KCET 2000, 05]
  A)
             5I and I                                    done clear
  B)
             5I and 3I done clear
  C)
             9I and I                                    done clear
  D)
             9I and 3I done clear
  View Solution play_arrow

• question_answer9)
  Light appears to travel in straight lines since [RPMT 1997; CPMT 1987, 89, 90, 2001; AIIMS 1998, 2002; KCET 2002; BHU 2002; DCE 2003]
  A)
             It is not absorbed by the atmosphere done clear
  B)
             It is reflected by the atmosphere done clear
  C)
             Its wavelength is very small done clear
  D)
             Its velocity is very large done clear
  View Solution play_arrow

• question_answer10)
  The idea of secondary wavelets for the propagation of a wave was first given by                               [Orissa PMT 2004]
  A)
             Newton                                  done clear
  B)
             Huygen done clear
  C)
             Maxwell                                  done clear
  D)
             Fresnel done clear
  View Solution play_arrow

• question_answer11)
  By a monochromatic wave, we mean                  [AFMC 1995]
  A)
             A single ray done clear
  B)
             A single ray of a single colour done clear
  C)
             Wave having a single wavelength done clear
  D)
             Many rays of a single colour done clear
  View Solution play_arrow

• question_answer12)
   The similarity between the sound waves and light waves is [KCET 1994]
  A)
             Both are electromagnetic waves done clear
  B)
             Both are longitudinal waves done clear
  C)
             Both have the same speed in a medium done clear
  D)
             They can produce interference done clear
  View Solution play_arrow

• question_answer13)
  The ratio of intensities of two waves is 9 : 1. They are producing interference. The ratio of maximum and minimum intensities will be                                   [MNR 1987 MP PET 1999; AMU (Engg.) 1999; AIIMS 2000]
  A)
             10 : 8                                         done clear
  B)
             9 : 1 done clear
  C)
             4 : 1                                           done clear
  D)
             2 : 1 done clear
  View Solution play_arrow

• question_answer14)
  A wave can transmit ...... from one place to another  [CPMT 1984]
  A)
             Energy                                     done clear
  B)
             Amplitude done clear
  C)
             Wavelength                          done clear
  D)
             Matter done clear
  View Solution play_arrow

• question_answer15)
  If the ratio of intensities of two waves is 1 : 25, then the ratio of their amplitudes will be                [CPMT 1984]
  A)
             1 : 25                                         done clear
  B)
             5 : 1                                           done clear
  C)
             26 : 24                                      done clear
  D)
             1 : 5 done clear
  View Solution play_arrow

• question_answer16)
  Two identical light sources S1 and S2 emit light of same wavelength l. These light rays will exhibit interference if [MP PMT 1993]
  A)
             Their phase differences remain constant done clear
  B)
             Their phases are distributed randomly done clear
  C)
             Their light intensities remain constant done clear
  D)
             Their light intensities change randomly done clear
  View Solution play_arrow

• question_answer17)
  Wave nature of light follows because              [MP PMT 1993]
  A)
             Light rays travel in a straight line done clear
  B)
             Light exhibits the phenomena of reflection and refraction done clear
  C)
             Light exhibits the phenomenon of interference done clear
  D)
             Light causes the phenomenon of photoelectric effect done clear
  View Solution play_arrow

• question_answer18)
  If L is the coherence length and c the velocity of light, the coherent time is                                           [MP PMT 1996]          
  A)
             cL    done clear
  B)
             \[\frac{L}{c}\] done clear
  C)
             \[\frac{c}{L}\]                       done clear
  D)
             \[\frac{1}{Lc}\] done clear
  View Solution play_arrow

• question_answer19)
  If the amplitude ratio of two sources producing interference is 3 : 5, the ratio of intensities at maxima and minima is [MP PMT 1996]
  A)
             25 : 16                                      done clear
  B)
             5 : 3 done clear
  C)
             16 : 1                                         done clear
  D)
             25 : 9 done clear
  View Solution play_arrow

• question_answer20)
  Colours of thin films result from   [CPMT 1972, 83, 96; RPMT 1997; DCE 2002; AIIMS 2005] or On a rainy day, a small oil film on water show brilliant colours. This is due to                                         [MP PET 2004]
  A)
             Dispersion of light               done clear
  B)
             Interference of light done clear
  C)
             Absorption of light             done clear
  D)
             Scattering of light done clear
  View Solution play_arrow

• question_answer21)
  For constructive interference to take place between two monochromatic light waves of wavelength l, the path difference should be                                                    [MNR 1992; UPSEAT 2001]
  A)
             \[(2n-1)\frac{\lambda }{4}\]  done clear
  B)
             \[(2n-1)\frac{\lambda }{2}\] done clear
  C)
             \[n\lambda \]                       done clear
  D)
             \[(2n+1)\frac{\lambda }{2}\] done clear
  View Solution play_arrow

• question_answer22)
  Two sources of waves are called coherent if [NCERT 1984; MNR 1995; RPMT 1996, 97; CPMT 1997; UPSEAT 1995, 2000; Orissa JEE 2002;  RPET 2003; MP PMT 1996, 2004]
  A)
             Both have the same amplitude of vibrations done clear
  B)
             Both produce waves of the same wavelength done clear
  C)
             Both produce waves of the same wavelength having constant phase difference done clear
  D)
             Both produce waves having the same velocity done clear
  View Solution play_arrow

• question_answer23)
  Soap bubble appears coloured due to the phenomenon of          [AFMC 1995, 97; RPET 1997; CBSE PMT 1999; Pb PET 2001]
  A)
             Interference                         done clear
  B)
             Diffraction done clear
  C)
             Dispersion                              done clear
  D)
             Reflection done clear
  View Solution play_arrow

• question_answer24)
  Which of the following statements indicates that light waves are transverse        [MP PMT 1995; AFMC 1996]
  A)
             Light waves can travel in vacuum done clear
  B)
             Light waves show interference done clear
  C)
             Light waves can be polarized done clear
  D)
             Light waves can be diffracted done clear
  View Solution play_arrow

• question_answer25)
  If two light waves having same frequency have intensity ratio 4 : 1 and they interfere, the ratio of maximum to minimum intensity in the pattern will be  [BHU 1995; MP PMT 1995; DPMT 1999; CPMT 2003]
  A)
             9 : 1                                           done clear
  B)
             3 : 1 done clear
  C)
             25 : 9                                         done clear
  D)
             16 : 25 done clear
  View Solution play_arrow

• question_answer26)
  Evidence for the wave nature of light cannot be obtained from                                                 [MP PET 1996]
  A)
             Reflection                              done clear
  B)
             Doppler effect done clear
  C)
             Interference                         done clear
  D)
             Diffraction done clear
  View Solution play_arrow

• question_answer27)
  Two light sources are said to be coherent if they are obtained from                                         [MP PET 1996]
  A)
             Two independent point sources emitting light of the same wavelength done clear
  B)
             A single point source done clear
  C)
             A wide source done clear
  D)
             Two ordinary bulbs emitting light of different wavelengths done clear
  View Solution play_arrow

• question_answer28)
  Wavelength of light of frequency 100Hz       [CBSE PMT 1999]
  A)
             \[2\times {{10}^{6}}m\]   done clear
  B)
             \[3\times {{10}^{6}}m\] done clear
  C)
             \[4\times {{10}^{6}}m\]   done clear
  D)
             \[5\times {{10}^{6}}m\] done clear
  View Solution play_arrow

• question_answer29)
  Two waves having intensity in the ratio 25 : 4 produce interference. The ratio of the maximum to the minimum intensity is                                                                      [CPMT 1999]
  A)
             5 : 2                                           done clear
  B)
             7 : 3 done clear
  C)
             49 : 9                                         done clear
  D)
             9 : 49 done clear
  View Solution play_arrow

• question_answer30)
  Wavefront means                                                   [RPMT 1997, 98]
  A)
             All particles in it have same phase done clear
  B)
             All particles have opposite phase of vibrations done clear
  C)
             Few particles are in same phase, rest are in opposite phase done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer31)
  Wave front of a wave has direction with wave motion [RPMT 1997]
  A)
             Parallel                                    done clear
  B)
             Perpendicular done clear
  C)
             Opposite                                done clear
  D)
             At an angle of q done clear
  View Solution play_arrow

• question_answer32)
  Which one of the following phenomena is not explained by Huygen's construction of wavefront [CBSE PMT 1992]
  A)
             Refraction                              done clear
  B)
             Reflection done clear
  C)
             Diffraction                              done clear
  D)
             Origin of spectra done clear
  View Solution play_arrow

• question_answer33)
  Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see [CBSE PMT 1993; DPMT 2000; BHU 2002]
  A)
             No interference                  done clear
  B)
             Interference with bright bands done clear
  C)
             Interference with dark bands                                           done clear
  D)
             Interference in which width of the fringe will be slightly increased done clear
  View Solution play_arrow

• question_answer34)
  The ratio of intensities of two waves are given by 4 : 1. The ratio of the amplitudes of the two waves is [CBSE PMT 1993]
  A)
             2 : 1                                           done clear
  B)
             1 : 2 done clear
  C)
             4 : 1                                           done clear
  D)
             1 : 4 done clear
  View Solution play_arrow

• question_answer35)
  For the sustained interference of light, the necessary condition is that the two sources should [DPMT 1996; RPMT 1998, 2003]
  A)
             Have constant phase difference done clear
  B)
             Be narrow done clear
  C)
             Be close to each other done clear
  D)
             Of same amplitude done clear
  View Solution play_arrow

• question_answer36)
  If the ratio of amplitude of two waves is 4 : 3, then the ratio of maximum and minimum intensity is          [AFMC 1997]
  A)
             16  : 18                                     done clear
  B)
             18 : 16 done clear
  C)
             49 : 1                                         done clear
  D)
             94 : 1 done clear
  View Solution play_arrow

• question_answer37)
  Which of the following is conserved when light waves interfere                                                [MNR 1998]
  A)
             Intensity                                 done clear
  B)
             Energy done clear
  C)
             Amplitude                              done clear
  D)
             Momentum done clear
  View Solution play_arrow

• question_answer38)
  Intensity of light depends upon                              [RPMT 1999]
  A)
             Velocity                                   done clear
  B)
             Wavelength done clear
  C)
             Amplitude                              done clear
  D)
             Frequency done clear
  View Solution play_arrow

• question_answer39)
  Ray diverging from a point source from a wave front that is          [RPET 2000]
  A)
             Cylindrical                               done clear
  B)
             Spherical done clear
  C)
             Plane                                        done clear
  D)
             Cubical done clear
  View Solution play_arrow

• question_answer40)
  Ratio of amplitude of interfering waves is 3 : 4. Now ratio of their intensities will be                         [RPET 2000]
  A)
             \[\frac{16}{9}\]                    done clear
  B)
             49 : 1 done clear
  C)
             \[\frac{9}{16}\]                    done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer41)
  Two coherent sources have intensity in the ratio of \[\frac{100}{1}\]. Ratio of (intensity) max/(intensity) min is  [RPET 2000]
  A)
             \[\frac{1}{100}\]                  done clear
  B)
             \[\frac{1}{10}\] done clear
  C)
             \[\frac{10}{1}\]                    done clear
  D)
             \[\frac{3}{2}\] done clear
  View Solution play_arrow

• question_answer42)
  If two waves represented by \[{{y}_{1}}=4\sin \omega t\] and \[{{y}_{2}}=3\sin \left( \omega t+\frac{\pi }{3} \right)\] interfere at a point, the amplitude of the resulting wave will be about                                    [MP PMT 2000]
  A)
             7     done clear
  B)
             6 done clear
  C)
             5     done clear
  D)
             3.5 done clear
  View Solution play_arrow

• question_answer43)
  The two waves represented by y1 = a sin(wt) and \[{{y}_{2}}=b\cos (\omega t)\] have a phase difference of       [MP PMT 2000]
  A)
             0     done clear
  B)
             \[\frac{\pi }{2}\] done clear
  C)
             p     done clear
  D)
             \[\frac{\pi }{4}\] done clear
  View Solution play_arrow

• question_answer44)
  In a wave, the path difference corresponding to a phase difference of f is                                           [MP PET 2000]
  A)
             \[\frac{\pi }{2\lambda }\varphi \]                                    done clear
  B)
             \[\frac{\pi }{\lambda }\varphi \] done clear
  C)
             \[\frac{\lambda }{2\pi }\varphi \]                                    done clear
  D)
             \[\frac{\lambda }{\pi }\varphi \] done clear
  View Solution play_arrow

• question_answer45)
  Two coherent sources of intensities, I1 and I2 produce an interference pattern. The maximum intensity in the interference pattern will be                                       [UPSEAT 2001; MP PET 2001]
  A)
             I1 + I2                                        done clear
  B)
             \[I_{1}^{2}+I_{2}^{2}\] done clear
  C)
             (I1 + I2)2                                   done clear
  D)
             \[{{(\sqrt{{{I}_{1}}}+\sqrt{{{I}_{2}}})}^{2}}\] done clear
  View Solution play_arrow

• question_answer46)
  Newton postulated his corpuscular theory on the basis of  [UPSEAT 2001; KCET 2001]
  A)
             Newton?s rings done clear
  B)
             Colours of thin films done clear
  C)
             Rectilinear propagation of light done clear
  D)
             Dispersion of white light done clear
  View Solution play_arrow

• question_answer47)
  The dual nature of light is exhibited by  [KCET 1999; AIIMS 2001; BHU 2001;  MH CET 2003; BCECE 2004]
  A)
             Photoelectric effect done clear
  B)
             Refraction and interference done clear
  C)
             Diffraction and reflection done clear
  D)
             Diffraction and photoelectric effect done clear
  View Solution play_arrow

• question_answer48)
  Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is \[\frac{\pi }{2}\] at point A and p at point B. Then the difference between the resultant intensities at A and B is  [IIT JEE (Screening) 2001]
  A)
             2I    done clear
  B)
             4I done clear
  C)
             5I    done clear
  D)
             7I done clear
  View Solution play_arrow

• question_answer49)
  Coherent sources are those sources for which  [RPET 2001]
  A)
             Phase difference remain constant  done clear
  B)
             Frequency remains constant done clear
  C)
             Both phase difference and frequency remains constant done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer50)
  Wave nature of light is verified by                           [RPET 2001]
  A)
             Interference                         done clear
  B)
             Photoelectric effect done clear
  C)
             Reflection                              done clear
  D)
             Refraction done clear
  View Solution play_arrow

• question_answer51)
  Two waves are represented by the equations \[{{y}_{1}}=a\sin \omega t\] and \[{{y}_{2}}=a\cos \omega t.\] The first wave                                                              [MP PMT 2001]
  A)
             Leads the second by p done clear
  B)
             Lags the second by p done clear
  C)
             Leads the second by \[\frac{\pi }{2}\] done clear
  D)
             Lags the second by \[\frac{\pi }{2}\] done clear
  View Solution play_arrow

• question_answer52)
  Light waves producing interference have their amplitudes in the ratio 3 : 2. The intensity ratio of maximum and minimum of interference fringes is                         [EAMCET 2001]
  A)
             36 : 1                                         done clear
  B)
             9 : 4 done clear
  C)
             25 : 1                                         done clear
  D)
             6 : 4 done clear
  View Solution play_arrow

• question_answer53)
  Laser beams are used to measure long distance because  [DCE 2001]
  A)
             They are monochromatic done clear
  B)
             They are highly polarised done clear
  C)
             They are coherent done clear
  D)
             They have high degree of parallelism done clear
  View Solution play_arrow

• question_answer54)
  Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is 25. The intensities of the sources are in the ratio                                        [UPSEAT 2002]
  A)
             25 : 1                                         done clear
  B)
             5 : 1 done clear
  C)
             9 : 4                                           done clear
  D)
             25 : 16 done clear
  View Solution play_arrow

• question_answer55)
  The frequency of light ray having the wavelength 3000 Å is  [DPMT 2002]
  A)
             9 ´ 1013 cycles/sec               done clear
  B)
             1015 cycles/sec  done clear
  C)
             90 cycles/sec                         done clear
  D)
             3000 cycles/sec done clear
  View Solution play_arrow

• question_answer56)
  Two waves have their amplitudes in the ratio 1 : 9. The maximum and minimum intensities when they interfere are in the ratio                                                             [KCET 2002]
  A)
             \[\frac{25}{16}\]                  done clear
  B)
             \[\frac{16}{26}\] done clear
  C)
             \[\frac{1}{9}\]                       done clear
  D)
             \[\frac{9}{1}\] done clear
  View Solution play_arrow

• question_answer57)
  Huygen?s principle of secondary wavelets may be used to   [KCET 2002]
  A)
             Find the velocity of light in vacuum done clear
  B)
             Explain the particle behaviour of light done clear
  C)
             Find the new position of the wavefront done clear
  D)
             Explain photoelectric effect done clear
  View Solution play_arrow

• question_answer58)
  What is the path difference of destructive interference   [AIIMS 2002]
  A)
             nl done clear
  B)
             \[n(\lambda +1)\] done clear
  C)
             \[\frac{(n+1)\lambda }{2}\]    done clear
  D)
             \[\frac{(2n+1)\lambda }{2}\] done clear
  View Solution play_arrow

• question_answer59)
  If an interference pattern have maximum and minimum intensities in 36 : 1 ratio then what will be the ratio of amplitudes                                                                       [AFMC 2002]
  A)
             5 : 7                                           done clear
  B)
             7 : 4 done clear
  C)
             4 : 7                                           done clear
  D)
             7 : 5 done clear
  View Solution play_arrow

• question_answer60)
  Intensities of the two waves of light are I and 4I. The maximum intensity of the resultant wave after superposition is                                                                           [MP PET 2002]
  A)
             5 I   done clear
  B)
             9 I done clear
  C)
             16 I                                            done clear
  D)
             25 I done clear
  View Solution play_arrow

• question_answer61)
  As a result of interference of two coherent sources of light, energy is                     [MP PMT 2002; KCET 2003]
  A)
             Increased done clear
  B)
             Redistributed and the distribution does not vary with time done clear
  C)
             Decreased done clear
  D)
             Redistributed and the distribution changes with time done clear
  View Solution play_arrow

• question_answer62)
  To demonstrate the phenomenon of interference, we require two sources which emit radiation [AIEEE 2003]
  A)
             Of the same frequency and having a define phase relationship done clear
  B)
             Of nearly the same frequency done clear
  C)
             Of the same frequency done clear
  D)
             Of different wavelengths done clear
  View Solution play_arrow

• question_answer63)
  When a beam of light is used to determine the position of an object, the maximum accuracy is achieved if the light is   [AIIMS 2003]
  A)
             Polarised                                done clear
  B)
             Of longer wavelength done clear
  C)
             Of shorter wavelength     done clear
  D)
             Of high intensity done clear
  View Solution play_arrow

• question_answer64)
  If the distance between a point source and screen is doubled, then intensity of light on the screen will become [RPET 1997; RPMT 1999]
  A)
             Four times                             done clear
  B)
             Double done clear
  C)
             Half                                           done clear
  D)
             One-fourth done clear
  View Solution play_arrow

• question_answer65)
  Huygen wave theory allows us to know              [AFMC 2004]
  A)
             The wavelength of the wave done clear
  B)
             The velocity of the wave done clear
  C)
             The amplitude of the wave done clear
  D)
             The propagation of wave fronts done clear
  View Solution play_arrow

• question_answer66)
  The wave theory of light was given by  [J & K CET 2004; KCET 2005]
  A)
             Maxwell                                  done clear
  B)
             Planck done clear
  C)
             Huygen                                   done clear
  D)
              Young done clear
  View Solution play_arrow

• question_answer67)
  The phase difference between incident wave and reflected wave is 180° when light ray                [RPMT 1998, 2001]
  A)
             Enters into glass from air done clear
  B)
             Enters into air from glass done clear
  C)
             Enters into glass from diamond done clear
  D)
              Enters into water from glass done clear
  View Solution play_arrow

• question_answer68)
  Which of the following phenomena can explain quantum nature of light                                               [RPMT 2001]
  A)
             Photoelectric effect           done clear
  B)
             Interference done clear
  C)
             Diffraction                              done clear
  D)
              Polarisation done clear
  View Solution play_arrow

• question_answer69)
  Which of the following is not a property of light  [AFMC 2005]
  A)
             It requires a material medium for propagation done clear
  B)
             It can travel through vacuum done clear
  C)
             It involves transportation of energy             done clear
  D)
             It has finite speed done clear
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• question_answer70)
  What causes changes in the colours of the soap or oil films for the given beam of light       [AFMC 2005]
  A)
             Angle of incidence              done clear
  B)
             Angle of reflection done clear
  C)
             Thickness of film                 done clear
  D)
             None of these done clear
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• question_answer71)
  Select the right option in the following                  [KCET 2005]
  A)
             Christian Huygens a contemporary of Newton established the wave theory of light by assuming that light waves were transverse done clear
  B)
             Maxwell provided the compelling theoretical evidence that light is transverse wave done clear
  C)
             Thomas Young experimentally proved the wave behaviour of light and Huygens assumption done clear
  D)
             All the statements give above, correctly answers the question ?what is light? done clear
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• question_answer72)
  Two waves of intensity I undergo Interference. The maximum intensity obtained is                        [BHU 2005]
  A)
             I / 2                                           done clear
  B)
             I done clear
  C)
             2I    done clear
  D)
             4I done clear
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