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Q.

A plano convex lens of focal length 100 cm has a convex surface of radius of curvature 60 cm. The refractive index of the lens is

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a

1.7

b

1.6

c

1.3

d

1.5

answer is B.

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Detailed Solution

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$\frac{1}{f} = (μ - 1) (\frac{1}{R})$

$\frac{1}{100} = (μ - 1) \frac{1}{60}$

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