First slide

The lens

Question

A double convex lens is made of glass of refractive index 1.5. If its focal length is 30 cm, then radius of curvature of each of its curved surface is

Moderate

A

10 cm
B

15 cm
C

18 cm
D

30 cm

Solution

$f = \frac{R}{2 (μ - 1)} \Rightarrow 30 = \frac{R}{2 (1 .5 - 1)} \Rightarrow R = 30 cm$

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