A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 654
of Fig. 583 is very crude, thedifferent beams giving coloured patches of light on the screen, withconsiderable overlapping. The spectrum is said to be impure. Agreat improvement may be effected by the arrangement shown inFig. 584. A bright source of light illuminates the slit S, and a lens L is… … Fig. 584— Arrangement for producing coloured images of a slit. the varying refractive index of the differently coloured beams. Ifthere is no overlapping of the variously coloured images the spectrumis said to be a pure spectrum. The pure spectrum is an ideal whichcan never be attained, owing to the…
Physics
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