Question

if the lenses are of the same material then the condition of achromatism of the lenses of same material by finite distance is givan by​

Answer 1

To minimize chromatic aberration the distance between two lenses is the average of there focal length. So, here given focal length are f

1

and f

2

.

So, f

average

=

2

f

1

+f

2

.

Answer 2

꧁༆ANSWER ༆꧂

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=2f1+f2.