Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 369
radius AB ; now this fraction■^f^ is called (in trigonometry) the sine of the angle DAB.Hence, ^^^ is the sine of the angle of incidence. Again, if wesuppose that the perpendicular CE is ^^ of the radius, thenthe fraction ^ is the sine of the angle of refraction. Thesines of the two angles are to… … Fig, 255. SNBLls LAW LAW OP SINES. 351 decimal fraction, is called the index of refraction. It can beproved to be the ratio of the velocity of the incident to that ofthe refracted light-waves. 308. Snells Law of Sines. — We have found that a rayof light in passing obliC[uely from a medium into…
Physics
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