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  4. If the refractive index of a material for red, yellow and voilet colours are 1.42, 1.50, 1.62. Then dispersive power of the material will be:

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Q. If the refractive index of a material for red, yellow and voilet colours are 1.42, 1.50, 1.62. Then dispersive power of the material will be:

Rajasthan PMTRajasthan PMT 1997

Solution:

Dispersive power of material $ \omega =\frac{{{n}_{\upsilon }}-{{n}_{r}}}{{{n}_{y}}-1} $ $ =\frac{1.62-1.42}{1.5}=1.33 $