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:
1. act as a convex lens only for the objects that lie on its curved side.
2. act as a concave lens for the objects that lie on its curved side.
3. act as a convex lens irrespective of the side on which the object lies.
4. act as a concave lens irrespective of the side on which the object lies.
(3) Hint: The nature of the prism depends on its refractive index and its radius of curvature.
Step 1: Use the lens maker's formula.
Here, R= 20cm, = 1.5, on substituting the values in of converging nature as f>0. Therefore, the lens act as a convex lens irrespective of the side on which the object lies.
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