[" Q1If the radius of curvature of "],[" concave lens is "30cm" find its."],[" focal length."]

The radius of curvature of a concave mirror is 30 cm. What is its focal length ?

The radius of curvature of a concave mirror is 30 cm what is its focal length?

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

Radius of curvature of a concave mirror is 25 cm. What is its focal length?

Define focal length of a concave mirror. Prove that the radius of curvature of a concave mirror is double its focal length.