The radius of curvature of the curved surface of a plano-convex lens is `20 cm`. If the refractive index of the material of the lens be `1.5`, it will

Options

A. act as a convex lens only for the objects that lie on its curved side
B. act as a concave lens for the objects that lie on its curved side
C. act as a convex lens irrespective of the side on which the object lies
D. act as a concave lens irrespective of side on which the object lies

Answer

C

Explanation

(c ) Here, R=20 cm ,`mu`=1.5, on substituting the values in `f=R/(mu-1)=20/(1.5-1)=40`cm of converging nature as `fgt0`. Therefore, lens act as a convex lens irrespective of the side on which the object lies.