Explain the terms angular dispersion and dispersive power. How are the two related ?
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Answer:
Angular dispersion:-The difference in the angle of deviation of any pair of colors is called angle disposition for these two colors. dispersive power:-The ability of a prism material to disperse the light rays is measured with dispersive power.
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 are defined as. D = It is the difference between the angles of minimum deviations for a pair.
Dispersive power. : the power of 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.