Question

A light ray strikes a mirror normally. What is the angle of reflection?

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

Answer 1

The correct option is C $0^{\circ }$

Angle of incidence is the angle between the incident ray and the normal. If the ray strikes the mirror normally, then, the angle of incidence is $0^{\circ }$.
From first law of reflection,
Angle of incidence = Angle of reflection
Therefore, the angle of reflection $=0^{\circ }$.