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 willA. act as a convex lens only for the objects that lie on its curved sideB. act as a concave lens for the objects that lie on its curved sideC. act as a convex lens irrespective of the side on which the object liesD. act as a concave lens irrespective of side on which the object lies

The radius of curvature of the curved surface of a plano-convex lens i

1.	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 willA. act as a convex lens only for the objects that lie on its curved sideB. act as a concave lens for the objects that lie on its curved sideC. act as a convex lens irrespective of the side on which the object liesD. act as a concave lens irrespective of side on which the object lies
Answer» Correct Answer - C (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.

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