The dispersive powers of glasses of lenses used in an achromatic pair are in the ratio 5 : 3. If the
Channel: Doubtnut
Date: 2020-08-23

The dispersive powers of glasses of lenses used in an achromatic pair are in the ratio 5 : 3. If the focal length of the concave lens is 15 cm , then the nature and focal length of the other lens would be