If the light ray is passing through the centre of curvature of a concave mirror, it doesn't deviate. Why ?

The line which passes through the centre of curvature and pole is………

An object is placed at the centre of curvature of a concve mirror. The distance between image and the pole is

What do you say about the ray which is passing through the normal of a mirror ?

The properties of image when a real object is kept in between focus and centre of curvature of a concave mirror.

Define focal length of a concave mirror. Prove that the radius of curvature of a concave mirror is double its focal length.

If we allow a light ray to pass through the focus, which path does it take ?