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

MHT CET Physics question

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

(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 liesCorrect
(D)act as a concave lens irrespective of side on which the object lies

Answer: (C)

Using the lens-maker formula with cm or cm, gives ,

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Question ID VK-069393