Published by:
CGP EDU Academic Team
Published on: August 13, 2026
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 n = 
. Light undergoes total internal reflection in the prism at the face PR when 
has a minimum value of 45°. The angle 0 of the prism is
Text Solution
Verified by ExpertsThe correct answer is:
A
For 
= 45°; by Snell's law,
1 x sin 45° = 
sin 
For TIR on face PR,
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