Question

Q3. Why does a ray passing through the centre of curvature of a spherical mirror retrace its path? What will
be the angle of incidence and reflection for this ray?
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Answer 1

Answer:

The light ray passing from the centre of curvature is perpendicular  or normal to the  the sphere of which the concave mirror is a part . because the ray from centre to mirror will act as the radius and we know that radius is perpendicular to the tangent at the point of contact.  hence angle of incidence = 0 degree , so angle of refraction will also be 0 degree , hence the ray will retrace its path .

The angle formed between the normal and the incident ray at the point of incidence is called the angle of incidence.Similarly, the angle formed between the normal and the reflected ray at the point of incidence is called the angle of reflection.