The dispersive powers of crown and flint glasses are `0.03` and `0.05` respectively.
Channel: Doubtnut
Date: 2020-08-23

The dispersive powers of crown and flint glasses are `0.03` and `0.05` respectively. The refractive indices for yellow light for these glasses are `1.517` and `1.621` respectively. It is desired to form an achromatic combination of prism of crown and flint glasses which can produce a deviation of `1^@` in the yellow ray. Find the refracting angles of the two prisms needed.