First slide

The lens

Question

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

Moderate

A

400 cm
B

200 cm
C

100 cm
D

50 cm

Solution

$\frac{1}{f} = (μ - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}}) \frac{1}{f} = (1 .6 - 1) (\frac{1}{60} - \frac{1}{\infty}) = \frac{1}{100} \Rightarrow f = 100 cm$

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