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

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1.7

1.6

1.3

1.5

answer is C.

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Detailed Solution

$\begin{array}{l} \frac{1}{f} = \frac{(μ_{g} - 1)}{R} \\ \frac{1}{100} = \frac{μ_{g} - 1}{60} \\ μ_{g} - 1 = \frac{60}{100} = 0.6 \end{array} u = 1.6$

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