Anomalous dispersion



a sudden change in the refractive index of a material for wavelengths in the vicinity of absorption bands in the spectrum of the material.
Historical Examples

Sellmeier’s equation may also be modified to apply to the case of anomalous dispersion.
The New Gresham Encyclopedia Various

The name given to this phenomenon,—“anomalous dispersion”—is an unfortunate one, as it has been found to obey a regular law.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 Various

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