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

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Q. The dispersive power of the material of lens of focal length $20\, cm$ is $0.08$. The longitudinal chromatic aberration in of the lens is

Ray Optics and Optical Instruments

Solution:

Here, $f=20\, cm,\, w=0.08$
Longitudinal chromatic aberration
$=w f=0.08 \times 20=1.6\, cm$