4 A parallel beam of light is incident from air at an angle

Last updated: 6/25/2023

4 A parallel beam of light is incident from air at an angle a on the side PQ of a right angled triangular prism of refractive index n 2 Light undergoes total internal reflection in the prism at the face PR when a has a minimum value of 45 The angle 9 of the prism is A 15 B 22 5 0 n 2 R C 30 45