Question

Process of decomposing using light

Answer 1

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The spectrum of the sun is hardly ever to be seen without suitable apparatus "in nature". Today everybody knows the colours seen on compact discs, and looking at the light of an incandescent lamp mirrored by a CD, one can see the mirror image of the lamp and, at different angles, the spectral decomposition of its light. compact disc

In former times, only under very special conditions this could be observed – if e.g. in a dark room a beam of sunlight fell on a piece of cut glass and produced a multicoloured strip at the wall, a (strange) spectre in the original meaning of the word. First perhaps incidentally observed, the conditions were then refined by Isaac Newton using glass prisms. Newton described the phenomenon and explained it by differently strong refraction of the different colours of light. But only William Hyde Wollaston (1804) and independently Joseph Fraunhofer (1814) developed the experimental assembly so far that they could see then also unexpectedly fine details in the solar spectrum: Absorption lines, the wavelengths of which could be measured by Fraunhofer and which afterwards were named after him.