Question

if the focal length of a convex mirror is 25cm what is its radius of curvature

Answer 1

Given f = 25
but f =R ÷2
also R= f×2

Substituting the value,
R= 25 × 2
R= 50

Note:- Sign convention matters

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Answer 2

Focal length is defined as the distance between the focus on principal axis and the pole on the same principal axis.

Spherical mirrors are those mirrors that have a curved reflecting surface.

In case of any spherical mirror, the focal length of always 1/2 of Radius of Curvature.

Hence,

Radius of Curvature = 2 * Focal Length = 2 * 25 = 50 cm