Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 20
fracted ray DF always lies on the opposite side of the normal GH to the incident ray CD, and, further, that the two rays CD and DF lie in the same plane as the normal GH. To find the relation, stated in the second law, between the angles of incidence and refraction, draw any circle with D as… … Fig. I. 4 SPECTROSCOPY sine of the angle FDH is equal to j-jc, and therefore, if theangles.CDG and FDH becalled i and r respectively— IK sin/ ID IK . Tr> TT. -.—■ = T-TT = invTj Since ID = LD.sin r LM LM LD „ ,„ , , , .sin / IK . , Snells law states that the ratio -—, or tttj, is constant for…
Spectrum analysis
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