Define dispersive power of a prism.

What is significance of dispersive power of a prism?

Define power of a lens

On what factors does the dispersive power of the material of a prism depend?

A prism with a refracting angle of 60^@ gives angles of minimum deviation 53^@,51^@ and 52^@ for blue,red yellow light respectively.What is teh dispersive power of the material of the prism?

Define 1 dioptre of power of a lens

Define 1 dioptre of power of a lens

The dispersive powers of the materials of the two lenses are in the ratio 4:3 .If the combination of these two lenses is of focal length 60 cm,then the focal lengths of the component lenses are: