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Q.

The radius of curvature of the convex face of a planoconvex lens is 12 cm and its refractive index is 1.5. What is the focal length of the lens?

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a

12 cm

b

18 cm

c

24 cm

d

30 cm

answer is C.

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Detailed Solution

1f1=(μ−1)1R=(1.5−1)112=124or f1=24cm which is choice (3).
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The radius of curvature of the convex face of a planoconvex lens is 12 cm and its refractive index is 1.5. What is the focal length of the lens?