heother end. Then, if, the slit be placed anywhere on this circle,the different spectra will be sharply focussed at various pointsabout the same circle. Moving the slit will of course cause thespectra to shift their position, but so long as the former 130 LIGHT remains on the circle, the latter… … Figure 70 90°. The slit is placed at the intersection of these two beams,i. e., at S. The grating G, and a plateholder P, to hold a longnarrow photographic plate, are mounted at opposite ends of athird beam, whose length is equal to the radius of curvatureof the grating. Thus, the center of…
Light
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