Q.1
A light ray is reflected off the surface of a plane mirror at 40 to the normal. What is the angle of reflection of the reflected ray?
  • 30o
  • 40o
  • 50o
  • 60o
Q.2
What determines how fast light travels in a medium?
  • Size of the medium
  • Shape of the medium
  • Refractive index of the medium
  • Color of the medium
Q.3
What equation can be used to calculate the refractive index of a substance?
  • Refractive index = 1 x sin c
  • Refractive index = 1 / sin c
  • Refractive index = 1 – sin c
  • Refractive index = 2 / sin c
Q.4
The critical angle of diamond is 24 degrees. What is its refractive index?
  • 0.6
  • 4.9
  • 2.4
  • 0.4
Q.5
Another equation for calculating the refractive index of a substance is ...
  • Refractive index = sin i x sin r
  • Refractive index = sin r / sin i
  • Refractive index = sin c / sin r
  • Refractive index = sin i / sin r
Q.6
If light enters a medium with an angle of incidence of 23 degrees and has an angle of refraction of 18 degrees, what is the refractive index of the medium?
  • 0.12
  • 1.3
  • 0.8
  • 0.7
Q.7
If a shiny surface is not smooth, what will happen to light rays incident upon it?
  • They will be reflected in numerous directions
  • They will be reflected towards one point
  • They will pass straight through the material
  • The light will be absorbed by the material
Q.8
When a light ray travels from air into glass, what can you say about the size of the angle of refraction compared to the angle of incidence?
  • It is bigger
  • It is the same
  • It is smaller
  • It is zero
Q.9
What direction does the incident ray bend when traveling from glass to air?
  • Towards the normal
  • Towards the glass
  • Towards the sea
  • Away from the normal
Q.10
Which of the following can reflect light?
  • Mirror
  • Water
  • Glass
  • All of the above
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