Physics

Problem

Two plane mirrors are inclined at

40^{\circ}

. A light ray strikes mirror

M_1

making an angle of

10^{\circ}

with the surface of

M_1

and is then reflected from

M_2

. What is the angle between the initial and the final directions of the ray after the two reflections? a)

60^{\circ}

40^{\circ}

80^{\circ}

100^{\circ}