First slide

The lens

Question

A plano convex lens is made of glass of refractive index 1.5. The radius of curvature of its convex surface is R. Its focal length is

Moderate

A

$\frac{R}{2}$
B

R
C

2R
D

1.5 R

Solution

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

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