Question

A ray of light is incident at an angle of `60^@` on the face of a prism having refracting angle `30^@.` The ray emerging out of the prism makes an angle `30^@` with the incident ray. Show that the emergent ray is perpendicular to the face through which it emerges.

Answer 1

Correct Answer - A::C::D
Given `i_1=60^@,A=30^@` and `delta=30^@`.
From the relation, `delta=(i_1+i+2)-A`
we have, `i_2=0`
This means that the emergne ray is perpendicular to the face through which it emerges.