Define: (a) Radius of curvature of spherical mirror (b) Focal length of spherical mirror.
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Solution
(a) Radius of curvature (R) of a spherical mirror is defined as the radius of an imaginary hollow sphere of which the mirror is a part.
(b) Focal length (f) of a spherical mirror is the distance of the point from the pole at which all the rays parallel to the principal axis are converged after reflection.