First slide

The lens

Question

A biconvex lens with equal radii curvature has refractive index 1.6 and focal length 10 cm. Its radius of curvature will be

Moderate

A

20 cm
B

16 cm
C

10 cm
D

12 cm

Solution

$f = \frac{R}{2 (μ - 1)} \Rightarrow 10 = \frac{R}{2 (1 .6 - 1)} \Rightarrow R = 12 cm$

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