Elements of natural philosophy (Volume 2-3) . s, at this point, will be less than at <9r, being nolonger in the same phase. The effect of the waves whose ELEMENTS OF OPTICS. 269 lengths are intermediate between Xr and \, will havetheir preponderance upon molecules between these twopoints, and the space Or Ov, should exhibit correspond-ing effects. And this is found by experiment to be thecase. For when a grating is formed by fine parallelEffectsoffanws rt , cut in plane glass wires, or by a series of fine furrows cut in the face ofa piece of well polished glass, and held in front of anylumi
Elements of natural philosophy (Volume 2-3) . s, at this point, will be less than at <9r, being nolonger in the same phase. The effect of the waves whose ELEMENTS OF OPTICS. 269 lengths are intermediate between Xr and \, will havetheir preponderance upon molecules between these twopoints, and the space Or Ov, should exhibit correspond-ing effects. And this is found by experiment to be thecase. For when a grating is formed by fine parallelEffectsoffanws rt , cut in plane glass wires, or by a series of fine furrows cut in the face ofa piece of well polished glass, and held in front of anyluminous source, there will be formed upon a screenplaced behind, a series of richly colored fringes, sepa-rated by dark intervals, and arranged along a line per-pendicular to the furrows. The furrows intercept thelight, while the intermediate spaces betwreen permit itto pass ; the former correspond to the even and the lat-ter to the odd portions of the luminous wave referred toabove, and form, as it were, a series of parallel linear II Fig. Illustration, radiants. The molecules <9r, 02rJ &c, where the longest waves prevail, exhibit red, and those at 0„, 02v, &c., Explanation of where the shortest preponderate, violet or lavender grey,tlie colors the molecules between exhibiting orange, yellow, green, blue and indigo, in the order named, beginning at the red. The line XT, being drawn from the luminous source to the middle of an opaque portion of the grating, the first fringe on either side of this line is formed by secondary waves whose radii differ by X, the second by 2 X, the third by 3 X, and so on; that is, every fringe is 270 NATURAL PHILOSOPHY. collateral fringes, formed by the conspiring of secondary waves wHose radiidiffer by some even multiple of ±\ while the dark spacbetween are produced by the opposition of waves ofwhich the radii differ by some odd multiple of IX. Effects of lighttransmittedthroughfarrowed glass; Effects of lightreflected fromthe same; Fraunh
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