The visible light are from the range of 700 to 400 nm, from red to purple. Human eyes detects colour with rods and cones, which are the receptor in our eyes. The rods detect shadow and lights, while the cones detect colours.
There are three kinds of cones, where one detect red and orange, the other one detect green, and the remaining one detect blue and violet. Primary colour means the colours that can be detected straight forwards with the cones, while secondary lights are the lights that's needing more than one cone to combine in order to detect the colour. The chromatic value means the luminance.
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