ght incident on it atj1, NAN the perpendicular to the sur-face, ji R the direction of the reflectedray, and ji T the direction of the re-fracted ray; then : The angle S A iVis the angle of inci-dence. The angle N A R ia the angle ofrefection. The line N A N 15 called the normal. The angle TAN is… … iOG LAWS OF REFRACTION. The line 6 n is called the sine of the angle of refraction.The line a m divided by the line 6 n is called the index ofrefraction, and is commonly represented by the letter n. 263. The general laws of the refraction of light may be thus•tated: 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)
