Question

define radius of curvature

Answer 1

the radius of a circle which touches the curve at a given point and has the same tangent and curvature at that point.

Answer 2

The radius of curvature is the radius of the hollow sphere of glass of which the mirror is a part

In figure, CP is the radius of curvature of the concave mirror and

In another figure the distance CP is the radius of curvature of the convex mirror the radius of curvature of mirror is represented by letter R.

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