Elements of natural philosophy (Volume 2-3) . lf a wave length, the two waves difference ofwill be in complete discordance; and, on the other hand, phase*they will be in complete accordance, and will unite theirstrength, when the retardation is an even multiple of thesame quantity. The successive dark and bright lineswill, therefore, be arranged in circles. § 168. We have been speaking here of homogeneous Phenomenali^ht. When white or compound light is used, the rings Prodllced witu & . white light; of different colors will be partially superposed, and theresult will be a series of iris-colore
Elements of natural philosophy (Volume 2-3) . lf a wave length, the two waves difference ofwill be in complete discordance; and, on the other hand, phase*they will be in complete accordance, and will unite theirstrength, when the retardation is an even multiple of thesame quantity. The successive dark and bright lineswill, therefore, be arranged in circles. § 168. We have been speaking here of homogeneous Phenomenali^ht. When white or compound light is used, the rings Prodllced witu & . white light; of different colors will be partially superposed, and theresult will be a series of iris-colored rings separated bydark intervals. All the phenomena, in fact, with the ex-ception of the cross, are similar to those of Newtonsrings; and we now see that they are both cases of thesame fertile principle,—the principle of rings are exhibited even in thick crystals, becausethe difference of the velocities of the two waves is very Analogous tosmall for rays slightly inclined to the optic axis. Newtons rings Fig.
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