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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 19 - Optical Instruments > 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 40cm. The focal length of crown glass lens will be

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 40cm. The focal length of crown glass lens will be

An eye specialist prescribes spectacles having combination of convex lens of focal length 40cm in contact with a concave lens of focal length 25cm. The power of this lens combination in diopters is