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Question

Total internal reflection takes place when the light ray travels from ______
  1. Rarer to denser medium
  2. Rarer to rarer medium
  3. Denser to rarer medium
  4. Denser to denser medium

A
Rarer to rarer medium
B
Rarer to denser medium
C
Denser to rarer medium
D
Denser to denser medium
Solution
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Total internal reflection always place when a light ray travels from an optically denser medium to a rarer medium.
For total internal reflection, angle of incidence must be greater than the critical angle,

C=sin11μ where, μ=refractive index of denser medium relative to rarer medium.

Answer-(C)

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