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Question

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 :
  1. (f1+f2)2
  2. (f1+f2)4
  3. (f1+f2)
  4. 2(f1+f2)

A
(f1+f2)
B
2(f1+f2)
C
(f1+f2)4
D
(f1+f2)2
Solution
Verified by Toppr

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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