A combination of the two thin lenses of the same material with focal length, $f_{1}$ and $f_{2}$ are arranged on a common axis. In order to minimize the chromatic aberration, the distance between them should be :

A

$4(f_{1}+f_{2}) $

B

$2(f_{1}+f_{2}) $

C

$(f_{1}+f_{2})$

D

$2(f_{1}+f_{2})$

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Solution

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Correct option is B)

To minimize chromatic aberration the distance between two lenses is the average of there focal length. So, here given focal length are $f_{1}andf_{2}$. So, $f_{average}=2f_{1}+f_{2} $.