A small plane mirror is placed at the centre of a spherical screen of radius

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

R

. A beam of light falls on the mirror. If the mirror makes

n

revolutions per second, the speed of the spot of light on the screen after reflection from the mirror is (a)

\frac{nR}{2\pi}

(b)

\frac{nR}{4\pi}

(c)

2\pi nR

(d)

4\pi nR