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), wheren₁andn₂are the indices of refraction at two specified widely differing wavelengths, andnis the index of refraction for the average of these wavelengths, or for the D line of sodium.

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