Question
What is a monochromatic radiation? Name the device used for obtaining a monochromatic radiation from polychromatic radiation
Answer :
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Radiation which is characterized only by a single frequency or a single wavelength is by definition a monochromatic radiation. But in fact, it only acts here as a purely theoretical case because the theory shows that an emission, in order to be rigorously monochromatic, will have neither a start nor finish, i.e. an infinite duration. Although this condition is unrealistic in practice, we know that some sources (monochromators, lasers) present qualities
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