Two plane mirrors

PHYSICS · Subjective · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

Two plane mirrors, each

1.6\,\mathrm{m}

long, face each other. The distance between the mirrors is

20\,\mathrm{cm}

. A light ray is incident at one end of one mirror at an angle of incidence

30^\circ

. How many times is the ray reflected before it reaches the other end?