Elements of natural philosophy (Volume 2-3) . flexions, these two are the™ ones which will give routes precisely equal; all theothers will differ by quantities amounting to some mul-tiple of t or i. If we now recur to the small differencein the interval i, for the points at which the rays respec-tively pass, it is obvious that by slightly altering the in-clination of the plates we may diminish the difference of ex^tJroutes to any amount, and may consequently make them colored fringes,differ by half a wave length, or any multiple of thesame; and we shall thus produce colored fringes
Elements of natural philosophy (Volume 2-3) . flexions, these two are the™ ones which will give routes precisely equal; all theothers will differ by quantities amounting to some mul-tiple of t or i. If we now recur to the small differencein the interval i, for the points at which the rays respec-tively pass, it is obvious that by slightly altering the in-clination of the plates we may diminish the difference of ex^tJroutes to any amount, and may consequently make them colored fringes,differ by half a wave length, or any multiple of thesame; and we shall thus produce colored fringes sepa-rated by dark bands, parallel to the intersection of theplanes of the glasses. COLORS OF THICK PLATES. § 107. Another phenomenon, whichdepends upon the same principle,and called the colors of thick plates,will be readily understood from pre-ceding; considerations. The effect is observed to takeplace under these circumstances,viz. : Light being transmitted througha small hole A, in a screen, and al-lowed to fall upon a spherical con-. Colors of thickplates; How they may-be exhibited; 292 NATURAL PHILOSOPHY. Facts withregard to thesecolors; How produced.
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