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 :
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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 f1andf2. So, faverage=2f1+f2.