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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

$\frac{( f _{1} + f _{2} )}{4}$

B

$\frac{( f _{1} + f _{2} )}{2}$

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 $f_{1} a n d f_{2}$ .
So, $f_{a v e r a g e} = \frac{f _{1} + f _{2}}{2}$ .

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