CBSE  /  Class 12  /  Physics  /  Wave Optics

  • 1. 
    A polaroid produces a strong beam of light which is :

  • circularly polarised
  • elliptically polarised
  • plane polarised
  • unpolarised

  • 2. 
    Images of a distant lamp seen through a fire cloth rotate on rotating the cloth. This is due to the phenomenon of:

  • interference
  • diffraction
  • polarisation
  • scattering

  • 3. 
    A young's double slit experiment uses a monochromatic source. The shape of interference fringes formed on a screen is :

  • parabola
  • straight line
  • circle
  • hyperbola

  • 4. 
    A monochromatic light is refracted from air into a glass of refractive index µ. The ratio of the wavelengths of the incident and the refracted waves is:

  • 1 : µ
  • 1 : µ²
  • µ : 1
  • µ² : 1

  • 5. 
    The focal length of the lens is 50 cm; then its power is:

  • +2D
  • +1D
  • -2D
  • -1D

  • 6. 
    In the above question, the number of the lens is:

  • +2
  • +1
  • -2
  • -1

  • 7. 
    The refractive index of diamond is about:

  • 1
  • 1.42
  • 2.42
  • 4.24

  • 8. 
    Two lenses having power +6 D and -4 D are placed in contact. The power of the combination is

  • -2D
  • -4D
  • +4D
  • +2 D

  • 9. 
    Diffraction was discovered by :

  • Grimaldi
  • Thomas Young
  • Malus
  • Huygens

  • 10. 
    The electromagnetic wave theory of light fails to explain :

  • compton effect
  • photoelectric effect
  • neither (a) nor (b)
  • Both (a) and (b)
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