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Lens Formula

The dispersiv...

Question

The dispersive power of material of a lens of focal length 20 cm is 0.08. What is the logitudinal chromatic aberration of the lens?

A

0.08 cm

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B

0.08/20 cm

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C

1.6 cm

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D

0.16 cm

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Solution

The correct option is C 1.6 cm
Longitudinal chromatic aberration $= ω f$
$= 0.08 \times 20 = 1.6 c m$

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