Question

A ray is reflected in turn by three plane mirrors mutually at right angles to each other. The angle between the incident and the reflected rays is.

• A. ${180}^{\circ }$
• B. $0^{\circ }$
• C. ${90}^{\circ }$
• D. ${45}^{\circ }$

Answer 1

The correct option is A ${180}^{\circ }$

The light is reflected back in the direction of the incident ray. Light rays undergo a rotation through 180 degrees. So the angle between the incident and reflected ray is 180 degrees . In this way, light is reflected back directly towards the source, but translated.