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Q.

The radius of curvature of the convex face of a plano convex lens is 15 cm and the refractive index of the material is 1.4 . Then the power of lens in dioptre is

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a

1.6

b

1.66

c

2.6

d

2.66

answer is D.

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Detailed Solution

P=1F=(μ−1)(1R1−1R2)     =(1.4−1)(1∞+10015)=4015=2.66 D .
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