Natural philosophy. being a hand-book of chemical physics, or, The physics of heat, light and electricity (1869)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 112
incident on it atA^ N A N the perpendicular to the sur-face, A R the direction of the reflectedray, and A T the direction of the re-fracted ray; then : The angle S A N \i the angle of inci-dence. The angle N A R is the angle ofrefection. The line N A N is called the normal. The angle T A N is… … lOG LAWS OF REFRACTION. The line 6 n is called the sine of the angle of refraction.The line a m divided by the line b n is called the index oftefraction, and is commonly represented by the letter n. 26*. The general laws of the refraction of light may be thusstated: I. The incident ray, the…
Physics
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-246-24.webp)
