Quiz  /  Prism Theory And Dispersion Of Light MCQ

  • 1. 
    The critical angle between an equilateral prism and air is 45. If the incident ray is perpendicular to the refracting surface, then

  • It is reflected totally from the second surface and emerges perpendicular from the third surface.
  • It gets reflected from second and third surfaces and emerges from the first surface
  • It keeps reflecting from all the three sides of the prism and never emerges out
  • After deviation, it gets refracted from the second surface

  • 2. 
    Which ray is least deviated by a prism?

  • Violet ray
  • Green ray
  • Red ray
  • Yellow ray

  • 3. 
    The angle of the prism is equal to the angle of minimum deviation for a prism of refractive index 1.5. What is the value of the angle of the prism?

  • 18
  • 36’
  • 20
  • 30’
  • 18
  • 19
  • 30’

  • 4. 
    The dispersive power of prism depends upon

  • 41
  • 82
  • 62
  • 31

  • 5. 
    When white light passes through the achromatic combination of prism, then what is observed

  • The shape of the prism
  • The material of the prism
  • The angle of the prism
  • Height of the prism

  • 6. 
    For a wavelength l the dispersion of the medium is D, then the dispersion for the wavelength 2l will be

  • Dispersion
  • Deviation
  • Dispersion and deviation
  • None of the above

  • 7. 
    The dispersive power will be maximum for

  • D/8
  • D/2
  • 2D
  • D
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