Two plane mirrors and are fixed perpendicular to each other
PHYSICS · Multi-part · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction
Problem
Two plane mirrors M1 and M2 are fixed perpendicular to each other. A light ray is first incident on M1 and, after reflecting from it, strikes M2, from which it is again reflected.
(a) If the ray is incident on M1 making an angle of 30∘ with the normal to M1, show that the ray emerging after the second reflection is parallel to the original incident ray.
(b) Determine the angle made by the ray with the normal to M2 at the point where it strikes M2.