The radius of curvature of a plane mirror of length `40 cm` is :

The radius of curvature of a plane mirror of focal length 40 cm is :

What is the radius of curvature of plane mirror?

The radius of curvature of a concave mirror whose focal length is 5 cm is ........... ............ ·.

The radius of curvature of a convex mirror is 40 cm what is its focal length?

The radius of curvature of a convex mirror is 40 cm. Find its focal length.

(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 ?