Two plane mirrors make an angle of 58^o. A light ray enters the system and is reflected once off each mirror. The ray is turned to A) 60^o. B) 120^o. C) 150^o. D) 180^o. E) 210^o.

Question

Quizplus · Accepted Answer

The angle by which a ray is turned after reflecting off two mirrors set at an angle θ is given by 360° - 2θ. For mirrors at a 60° angle, the ray is turned by 360° - 2(60°) = 240°. However, since the ray reflects off each mirror once, effectively, it is turned through an angle of 360° - 240° = 120°.

Two Plane Mirrors Make an Angle of 58o

Two Plane Mirrors Make an Angle of 58^o