Two lenses have focal lengths `f_(1)` and `f_(2)` and their dispersive powers are `omega_(1)` and
Channel: Doubtnut
Date: 2020-08-23

Two lenses have focal lengths `f_(1)` and `f_(2)` and their dispersive powers are `omega_(1)` and `omega_(2)` respectively. They will together form an achromatic combination if