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Questions related to the perception and measurement of light (primarily in the visible range), its mathematical description, the reproduction of colors by different means, color combinations, etc. Please use the tag [electromagnetic-radiation] if you want to refer to the general form of light.
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Are we seeing everything in a delayed manner?
The speed of light in any medium is given by the speed of light in vacuum divided by the relative refractive index of the given material. Now the relative refractive index of vacuum is obviously one. …