The radius of culvature 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

Question

$\begin{array}{1 1} \text{act as a convex lens only for the objects that lie on its curved side } \\ \text{act as a concave lens for the objects that lie on its curved side } \\ \text{act as a convex lens irrespective of the side on which the object lies } \\ \text{act as a concave lens irrespective of side on which the object lies } \end{array}$