First slide

The lens

Question

The radius of the convex surface of plano-convex lens is 20 cm and the refractive index of the material of the lens is 1.5. The focal length of the lens is

Moderate

A

30 cm
B

50 cm
C

20 cm
D

40 cm

Solution

$\frac{1}{F} = (1 .5 - 1) (\frac{1}{20} - \frac{1}{\infty}) \Rightarrow F = 40 cm$

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