GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
A beam of white light dispersed by a diffraction grating. Shown here is a beam of white light after it passes through a diffraction grating. Diffracted light propagates along discrete directions, called diffraction orders. The zeroth order does not exhibit dispersion (white beam), while within the two first orders white light is dispersed (decomposed) into different colours.
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