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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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It would help if you imagine a lot of photons propagating in all directions. Each photon propagating in a straight line.
answered Feb 23 '17 by IvanMartinez