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# A combination of the two thin lenses of the same material with focal length, f1 and f2 are arranged on a common axis. In order to minimize the chromatic aberration, the distance between them should be :(f1+f2)2(f1+f2)4(f1+f2)2(f1+f2)

A
(f1+f2)
B
2(f1+f2)
C
(f1+f2)4
D
(f1+f2)2
Solution
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#### To minimize chromatic aberration the distance between two lenses is the average of there focal length. So, here given focal length are f1 and f2. So, faverage=f1+f22.

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