dispersive power

dispersive power
noun
: 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

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Optics.
a measure of the ability of a substance to disperse light, equal to the quotient of the difference in refractive indices of the substance for two representative wavelengths divided by the difference of the refractive index for an intermediate wavelength and 1. Cf. Abbe number.

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dispersive power,
Physics. the power of a substance to separate light rays by diffraction. It is measured by the ratio of the dispersion of the red and blue wave lengths to the deviation of the yellow produced by a prism of small angle.

Useful english dictionary. 2012.

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