dispersive power


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dispersive power

[də′spər·siv ‚pau̇·ər]
(optics)
A measure of the power of a medium to separate different colors of light, equal to (n2- n1)/(n- 1), where n1 and n2 are the indices of refraction at two specified widely differing wavelengths, and n is the index of refraction for the average of these wavelengths, or for the D line of sodium.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.