Question

A parallel beam of light is incident from air at an angle on the side PQ of a right-angled  triangular prism of refractive index . Light undergoes total internal reflection in the prism at the face PR when  has minimum value of . The angle of the prism is:

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A

B

C

D

Hard
Solution
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Correct option is A)

Applying Snell's law at surface PQ,

at


Applying Snell's law at surface PR




Thus option A

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