It is desired to make an achromatic combination of two lenses, `(L_(1)& L_(2))`
Channel: Doubtnut
Date: 2020-04-12

It is desired to make an achromatic combination of two lenses, `(L_(1)& L_(2))` made of materials having dispersive power `omega_(1)` and `omega_(2)(ltomega_(1))`. If the combination of lenses is converging then: