The dispersive powers of crown and flint glasses are `0.02` and `0.04` respectively. In a
Channel: Doubtnut
Date: 2020-01-19

The dispersive powers of crown and flint glasses are `0.02` and `0.04` respectively. In an achromatic combination of lenses the focal length of flint glass lens is `40 cm`. The focal length of crown glass lens will be