Question

When a ray of light falls normally (or perpendicularly) on the surface of a mirror, the angle of reflection will be _____.

• A. 90°
• B. 45°
• C. 180°
• D. 0°

Answer 1

The correct option is D 0°

If a ray of light is incident normally on a mirror, it means that it is travelling along the normal to the mirror. The angle between the normal and incident ray is called angle of incidence and angle between the normal and reflected ray is called angle of reflection So, the angle of incidence of light here is 0°. Then, by the laws of reflection, angle of reflection is also 0°.