Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 40
hs. In the case of complex light, which consists of waves ofmany different lengths, there are just as many values of DE,with which a bright image of the slit is produced, and, as eachof these has a different colour, a spectrum is produced in whicheach colour is distributed strictly according to its… … Fig. II. spectrum, a second, which corresponds, to the condition thatDE is equal to four half wave-lengths; and again, outside this,a third, and so on. These spectra are called respectively thoseof the first, second,, third, etc., orders, these being the nameswhich were given by Fi/aunhofer. The…
Spectrum analysis
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