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  4. The refractive index of a particular material is 1.67 for blue light, 1.65 for yellow light and 1.63 for red light. The dispersive power of the material is .........

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Q. The refractive index of a particular material is $1.67$ for blue light, $1.65$ for yellow light and $1.63$ for red light. The dispersive power of the material is .........

KCETKCET 2004Ray Optics and Optical Instruments

Solution:

$\omega=\frac{\mu_{ v }-\mu_{ r }}{\mu_{ y }-1}=\frac{1.67-1.63}{1.65-1}=0.615$