1.

Define angular dispersion & dispersive power.

Answer»

Angular Dispersion: D &Dispersive Power: w. The capacity of the material of a prism, to disperse a given beam of light into of its constituent colors, is measured by the two quantities D & w; which aredefinedas. D = It is the difference between the angles of minimum deviations for a pair.

Dispersive power. : thepowerof a transparent medium to separate different colors of light by refraction as measured by the difference in refractivity for two specified widely differing wavelengths divided by the refractivity at some specified intermediate wavelength.



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