First slide

The lens

Question

The dispersive power of the material of lens of focal length 20 cm is 0.08. The longitudinal chromatic aberration of the lens is

Moderate

A

0.08 cm
B

0.08/20 cm
C

1.6 cm
D

0.16 cm

Solution

Longitudinal chromatic aberration
$= ωf = 0 .08 \times 20 = 1 .6 cm$

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