Light Visible And Invisible a Series of Lectures Delivered At the Royal Institu
Light Visible And Invisible a Series of Lectures Delivered At the Royal Institu
Silvanus Phillips Thompson
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A red rose with green leaves appears a green rose with reddish leaves. A blue star on a yellow ground appears as a yellow star on a bluish ground. Black printing on a white paper appears whitish printing on a grayish paper, and so forth. APPENDIX TO LECTURE II ANOMALOUS REFRACTION AND DISPERSION ON p. 78 attention is drawn to the circumstance that the spectrum as produced by a prism is irrational ; that is to say, that the dispersion is such that the different waves are not spaced out in propor...tion to their wave-length, the red and orange waves . Being relatively crowded together at one end of the spectrum, while the violet and blue waves are unduly spread out. But the dispersion is different on different substances. In fact, no two substances disperse the light in exactly the same way, though in general the order of the colours is the same, and the general trend of the irrationality is to compress the red end. But there are a few known substances in which this irrationality becomes excessive, and develops into an entirely abnormal dispersion in which the violet waves are less refracted than the red !
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