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A good question that I have had students ask me involves the color the light laser light would look if, instead of observing it from outside of the glass as we nearly always do, you were inside the glass. I suspect that, even though the wavelength and speed were different, you would see the same color.
When light enters the eye the wavelength becomes dependent on the index of refraction of the fluid in the eye - regardless of what media the light went through previously. The fact that you see the light as red when it passes through water does not, per se, prove that perceived color depends on frequency instead of wavelength.