The focal length of convex mirror is 16 cm. What is its radius of curvature ?

The focal length of the convex lens is 10m . What is its power ?

The ratio of the focal length of spherical mirror to its radius of curvature is

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

The focal length of an equi-convex lens is greater than the radius of curvature of any of the surfaces. Then, the refractive index of the material of the lens is

The focal length of a huge concave mirror is 120 cm. A man is standing in front of it at a distance of 40cm. What are the characteristics of his image in that mirror?