The radius of curvature of the curved surface of a plano-convex lens is 60 cm . If refractive index of the material of prism is 1.6 , then focal length of the lens is

Step-by-step solution

Given, refractive index of plano convex lens, =1.6 Radius of curvature, R₁=60 ~cm By lens Maker's formula, focal length is given by aligned 1 f & =( -1) ( 1 R₁ - 1 R₂ ) & =(1.6-1) ( 1 60 - 1 ) [ R₂= ] & = 0.6 60 = 0.1 10 1 f & =0.01 f & = 1 0.01 =100 ~cm aligned