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of refraction of light in a prism depends on the refractive index of the prism material. Since that refractive index varies with wavelength, it follows that the angle that the light is refracted by will also vary with wavelength, causing an angular separation of the colors known as angular dispersion.

For visible light, the refraction index n of most transparent materials (e.g., air, glasses) decreases with increasing wavelength ?:
: or generally,
:

In this case, the medium is said

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