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A plano convex lens is made of material having refractive index 1.5. The radius of curvature of curved surface is 60 cm.

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A plano convex lens is made of material having refractive index 1.5. The radius of curvature of curved surface is 60 cm. The focal length of the lens is ______ cm.

(A)  –60

(B)  120

(C)  60

(D)  –120

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Correct option  (B) 120

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