First slide

The lens

Question

A planoconvex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is

Moderate

A

50 cm
B

100 cm
C

200 cm
D

400 cm

Solution

$f = \frac{R}{(μ - 1)} = \frac{60}{(1 .6 - 1)} = 100 cm$

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