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Complementary wavelength

The complementary wavelength lc is determined as follows:

All colors do not have a dominant wavelength. These colors are called non-spectral. For example the color Q (see figure above) does not have a dominant wavelength since the line from W to Q when extended meets the purple line in L. In such cases, the line is extended in the opposite direction and when it meets the visual spectrum at lc, that wavelength is called the complementary wavelength for the color. In this case, the wavelength of lc is the complementary wavelength of Q. Thus mixing lc with Q will help us to get the achromatic color W.