(a) What is focal length of a convex mirror of radius of curvature `20 cm`?
(b) What is radius of curvature of a mirror of focal length `- 50 cm` ?

Explanation

Radius of curvature, R = 32 cm
Radius of curvature = 2 × Focal length (f)
`R = 2ff=R//2=32//2=16`
Hence, the focal length of the given convex mirror is 16 cm.