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 .