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THE PHYSICS OF COLOUR

We have already seen, in Chapter 2, that white light can be dispersed by means of a prism into light of different hues – violet, indigo, blue, green, yellow, orange and red, ‘all the colours of the rainbow’ – and that these hues correspond to different wavelengths. The wavelengths of visible electromagnetic radiation range from approximately 380 to 780 nm. In practice, light is never made of a single wavelength but of a narrow band or a large combination of wavelengths. Light consisting of a single wavelength – or a narrow band of wavelengths – is highly saturated in colour. Thes...

From

Cover of The Manual of Photography and Digital Imaging, 10th Edition

Note

Color, light, prisms and rainbows.