Question

What is relation between radius of curvature
and curvature ?​

Answer 1

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In differential geometry, the radius of curvature, R, is the reciprocal of the curvature. For a curve, it equals the radius of the circular arc which best approximates the curve at that point. For surfaces, the radius of curvature is the radius of a circle that best fits a normal section or combinations thereof

Answer 2

Explanation:

Radius of Curvature is the distance between centre of curvature and the pole of a spherical mirror.

On the other hand, curvature is how much the spherical mirror is the degree to which the mirror is curved.