English: Please note, this figure shows the ideal case of no dispersion, which means that the refractive index n is independent of the wavelength . In reality n will depend on and hence the wave front (governed by group velocity) will no longer be perpendicular to the direction of the radiation (governed by phase velocity).
Deutsch: Bitte beachten, dass diese Abbildung nur den idealen Fall ohne Dispersion zeigt, also Brechungsindex n unabhängig von . In der Realität ist n eine Funktion von und damit werden die Wellenfront (bestimmt durch die Gruppengeschwindigkeit) und die Ausbreitungsrichtung des Lichts (bestimmt durch die Phasengeschwindigkeit) nicht mehr senkrecht aufeinander stehen.
Date
16 March 2006 (original upload date)
Source
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