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

Focal length of the plano-convex lens is when its radius of curvature of the surface is R and n is the refractive index of the lens.

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

A convex lens has its radii of curvature equal. The focal length of the lens is f. If it is divided vertically into two identical plano-convex lenses by cutting it, then the focal length of the plano-convex lens (p = the refractive index of the material of the lens)

Define focal length and radius of curvature of a concave lens.