what is radius of curvature and centre of curvature of a mirror
Radius of curvature
Radius of curvature is the distance between center of curvature to pole of mirror or lens measured along the Principal Axis from the pole.
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).