Two mirrors are joined together along a common side, the planes of the mirrors separated by the angle $\theta$ . If the joined mirrors can be used as a retroreflector when a beam of light strikes both surfaces (one after the other), what is the value of$\theta$ ?
A) 90°
B) 135°
C) 45°
D) 30°

Question

Quizplus · Accepted Answer

A retroreflector requires the angle between the mirrors to be 90° so that the light reflects back parallel to the incident beam.

Two Mirrors Are Joined Together Along a Common Side, the Planes