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Hi Paul;
Newton's laws also don't work for fast moving objects (relativity) nor apply to subatomic particles.
In dispersive media (most materials) different wavelengths travel at slightly different speeds so the refractive indexes in Snell's law ought to be slightly different for each wavelength. But usually we treat it as a constant for all wavelengths. This doesn't matter if the light enters and exits from a media with parallel sides but splits white light into color if the sides are not parallel.
kyle