Can you please help me to understand the curvatures of spherical mirrors? The centre of curvature and the radius of curvature? 

Hi Madhulika!

Centre of curvature

The centre of curvature is the centre of a sphere from which the given spherical mirror (convex or concave) is obtained. It is denoted by the letter (C).

Radius of curvature

The distance between the centre of curvature and pole (PC) is known as the radius of curvature.

Hope this is clear to you.

Cheers!!