If a ray of light is incident passing through the centre of curvature of a concave mirror, then the angle between the incident ray and the reflected ray will be equal to:

Correct option is A

The correct answer is (a) 0°.

When a ray of light passes through the center of curvature of a concave mirror, it hits the mirror's surface perpendicularly (normal to the surface) since it travels along the radius of the mirror. This makes the angle of incidence 0° because the ray is incident directly along the normal.

According to the law of reflection, the angle of incidence equals the angle of reflection. Therefore, the reflected ray retraces the path of the incident ray, effectively overlapping with it.

Conclusion:

Since the incident and reflected rays are on the exact same path, the angle between them is 0°.