A corner cube is formed by three plane mirrors perpendicular to one another resulting in a retroreflector. What is the angle between the directions of an incoming ray of light and of the corresponding outgoing ray of light for this device?
A) 90 $\degree$
B) 180 $\degree$
C) 0 $\degree$
D) 360 $\degree$

Question

Quizplus · Accepted Answer

The angle between the incoming and outgoing rays is 180 degrees because the incoming ray is reflected three times by the three mirrors, each time at an angle of 90 degrees.

A Corner Cube Is Formed by Three Plane Mirrors Perpendicular °\degree°

A Corner Cube Is Formed by Three Plane Mirrors Perpendicular $\degree$