First slide

Plane mirror

Question

Two vertical plane mirrors are inclined at an angle of 60° with each other. A ray of light travelling horizontally is reflected first from one mirror and then from the other. The resultant deviation is

Moderate

A

60°
B

120°
C

180°
D

240°

Solution

$δ = (360 - 2 θ) = (360 - 2 \times 60) = 240^{\circ}$

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