ually the case, the grating ismounted on the table of a spectrometer, so that the telescopemay be swum: about an axis through the grating perpendicularto the plane of the diagram, then it can be turned so as toreceive upon the cross-hair at the principal focus any wave-length in any order of… … Figure 69 to different wavelengths would seriously overlap, unless thesemaxima were quite sharp, as indicated in figure 65 (Y). Itremains to show why the large number of slits in the gratingproduces the desired sharpness. Consider figure 60. AB represents a grating, which forthe sake of…
Light
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