. Carnegie Institution of Washington publication. 17 18 or less, produce the fringes. This may be treated from a graphic point ofview as follows, a theory not being aimed at: In figure 18, let a and b be two patches of light of like color and origin atthe objective pp, figure 17, producing interferences at the focus F. Hencethe fringes will be arranged in the direction/, figure 18, at right angles to the REVERSED AND NON-REVERSED SPECTRA. 31 line joining a and b. Since a and b here correspond to c and c in figure 17, leta be continually displaced to the right, as indicated by the arrows, figur
. Carnegie Institution of Washington publication. 17 18 or less, produce the fringes. This may be treated from a graphic point ofview as follows, a theory not being aimed at: In figure 18, let a and b be two patches of light of like color and origin atthe objective pp, figure 17, producing interferences at the focus F. Hencethe fringes will be arranged in the direction/, figure 18, at right angles to the REVERSED AND NON-REVERSED SPECTRA. 31 line joining a and b. Since a and b here correspond to c and c in figure 17, leta be continually displaced to the right, as indicated by the arrows, figure proportion as the positions ab, ab, ab, are taken, the fringes must passby rotation from /, into /, into /, etc.—, over about 90°. In the presentexperiment, c, figure 17, can never pass across c, for they are essentiallyseparated by the edge of the right-angled prism P. Hence the rotation cannot exceed 90°, for the vertical through a can not cross the vertical through is not the case when a grating replaces P, as in figure
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