Joseph von Fraunhofer
Absorption Spectra (Joseph von Fraunhofer)
In 1814 Joseph von Fraunhofer noticed that the light from the sun does not give a continuous spectrum. By using an unusually good prism, Fraunhofer observed a series of dark lines in the sun's spectrum, the more prominent of which he labeled A through H. Fraunhofer's experiment is an example of an absorption spectrum, some of the light given off by the sun is apparently absorbed before it reaches the earth.
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