Question

Define focal length and radius of curvature of a spherical mirror

Answer 1

the length from pole to the focus is called focal length.
The radius of the circle formed with the curved part of the lens is known as radius of curvature.
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Answer 2

A point on the principal axis of a spherical mirror where the rays of light parallel to the principal Axis meet or appear to meet after reflection from a speedometer for principal focus it is denoted by F.

The radius of a hollow sphere of a hollow sphere of which a Spherical mirror forms apart is called radius of curvature of a concave mirror it is denoted by R.