Quiz  /  MCQ On Wave Optics

  • 1. 
    Which of the following phenomenon is not explained by Huygen’s wave theory?

  • Diffraction
  • Interference
  • Polarisation
  • Photoelectric effect

  • 2. 
    Polarisation phenomenon explains which nature of light?

  • Transverse
  • longitudinal
  • Both transverse and longitudinal
  • geometrical

  • 3. 
    A narrow slit is taken and a parallel beam of moving electrons is incident normally on it. At a larger distance from the slit, a fluorescent screen is placed. Which of the following statement is true if the size of the slit is further narrowed?

  • The diffraction pattern cannot be observed on the screen
  • The angular width of the central maxima of the diffraction pattern will increase
  • The angular width of the central maxima of the diffraction pattern will decrease
  • The angular width of the central maxima of the diffraction pattern remains the same

  • 4. 
    How does the diffraction band of blue light look in comparison with the red light?

  • No changes
  • Diffraction pattern becomes narrower
  • Diffraction pattern becomes broader
  • Diffraction pattern disappears

  • 5. 
    Two coherent sources of light can be obtained from

  • Two different lamps
  • Two different lamps but of the same colour
  • Two different lamps of the same colour and having the same colour
  • None of these

  • 6. 
    What is the value of coherent time if L is the coherent length and c is the velocity of light?

  • cL
  • L/c
  • c/L
  • 1/Lc

  • 7. 
    The ratio of the amplitude of the two sources producing interference 3 : 5, the ratio of intensities at maxima and minima is

  • 25:6
  • 5:3
  • 16:1
  • 25:9

  • 8. 
    The colours on the soap bubble is due to

  • Interference
  • Polarisation
  • Diffraction
  • Reflection

  • 9. 
    Which of the following statements indicates that light waves are transverse?

  • Light waves can be polarised
  • Light waves can show interference
  • Light waves undergo diffraction
  • They travel in the vacuum
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