First slide

The lens

Question

A plano convex lens (f = 20 cm) is silvered at plane surface. Now f will be

Moderate

A

20 cm
B

40 cm
C

30 cm
D

10 cm

Solution

$\frac{1}{F} = \frac{2}{f_{l}} + \frac{1}{f_{m}} \Rightarrow \frac{1}{F} = \frac{2}{20} + \frac{1}{\infty} \Rightarrow F = 10 cm$

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