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Q.

A right angled prism is made up of a material of refractive index μ. It is desired that a light ray incident normally on PQ emerges parallel to the incident direction after suffering two total internal reflection. In which of the following conditions is this possible ?

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a

Never possible

b

μ=1.3

c

μ=2

d

μ=3

answer is A, B.

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Detailed Solution

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As total internal reflection is taking place at both of the surfaces PR and RQ

θc≤θ and θc≤900-θ

⇒θc≤450

sinθc≤12⇒1μ≤12

⇒μ≥2

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