A double convex lens is made of glass of refractive index `1.55` with both faces of same radius of curvature. Find the radius of curvature required, if focal length is `20 cm`.

(a) Monochromatic light of wevelengh 589 nm in incident from air on a water surface. If mu for water is 1.33, find the wevelength, frequency and speed of the refracted light . (b) A duble conbex lens is made of a glass of refractive index 1.55 , with both faces of the same radius of curbature. Find the radius of curvature required , if the focal length is 20 cm.

A double convex lens of + 5 D is made of glass of refractive index 1.5 with both faces of equal radii of curvature. Find the value of curvature.

Double convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length of the lens is to be 20 cm?

A double convex lens is made of glass of refractive index 1.5. If its focal length is 30 cm, then radius of curvature of each of its curved surface is

A plano convex lens is made of glass of refractive index 1.5. The radius of curvature of its convex surface is R. Its focal length is

A plano-convex lens is made of glass of refractive index 1.6. the radius of curvature of its curved surface is 30 cm. What is the focal length of the lens ?

A double-convex lens is to be made of glass with an index of refraction of 1.5 . One surface is to have 2 times the radius of curvature of the other and the focal length is to be 60mm . What is the (a) smaller and (b) larger radius?