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Q.

The radius of curvature of convex surface of a thin plano-convex lens is 15 cm and refractive index of its material is 1.6. The power of the lens will be

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a

+1D

b

−2D

c

+3D

d

+4D

answer is D.

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Detailed Solution

f=R(μ−1)=15(1.6−1)=25cm ∴P=100f=10025=+4D
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