Question

A light ray passing through the centre of curvature of a concave mirror is incident on the mirror surface. The value of the angle of reflection will be:

• A. 60°
• B. 90°
• C. 0°
• D. 120°

Hint:

When a light ray passes through the centre of curvature of a concave mirror, the angle of incidence and angle of reflection are both 0°.

Answer 1

The Correct Option is C

When a light ray passes through the centre of curvature of a concave mirror, it strikes the mirror’s surface perpendicularly. Since the incident ray is perpendicular to the surface, the angle of incidence is 0°. According to the law of reflection, the angle of reflection is equal to the angle of incidence. Hence, the angle of reflection is also 0°.
Step 1: Angle of incidence.
The angle of incidence is the angle between the incident ray and the normal to the mirror's surface. Since the ray passes through the centre of curvature, this angle is 0°.
Step 2: Angle of reflection.
According to the law of reflection, the angle of reflection is equal to the angle of incidence. Therefore, the angle of reflection is 0°.
Step 3: Conclusion.
Thus, the correct answer is (C) 0°.