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Non-dispersive mediums for light
Apart from the vacuum are there other mediums for which light velocity does not depend on frequency?
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Are there optical materials with larger mean deviation with little to zero angular dispersion?
The following statement is from Concepts of Physics by Dr. H.C.Verma, from the chapter "Dispersion and Spectra", page 434, topic "Dispersive Power":
The mean deviation depends on ...
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