Two plane mirrors are placed perpendicular to each other

PHYSICS · Single correct · IGCSE · Physics · Waves · Waves

Problem

Two plane mirrors are placed perpendicular to each other. A light ray strikes the first mirror making an angle of

30^{\circ}

with its surface and then reflects from the second mirror. The angle between the final ray and the original incident ray is (a)

60^{\circ}

(b)

180^{\circ}

(c)

90^{\circ}

(d)

120^{\circ}