First slide

The lens

Question

A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with refractive index 1.65. Its focal length is nearly

Moderate

A

20 cm
B

31 cm
C

35 cm
D

50 cm

Solution

$f = \frac{R}{2 (μ - 1)} \Rightarrow f = \frac{40}{2 (1 .65 - 1)} \approx 31 cm$

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