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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from ...Show synopsisThis historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ... first. Thus, representing the speeds of light of a given frequency in vacuo, and in two media by s, si, and s2, respectively, then the absolute indices of refraction of the two media are and the index of refraction of the second medium relative to the first is a (131) It is readily shown that when light goes from one medium to another in which the velocity is different, the ratio of the sines of the angles between the normal to the interface and the rays in the two media equals the ratio of the speeds in the two media. That is, sin ji _ si sin fa S2 Consequently, (131), f M = sin L nu sin #2 v' This is called Snell's law. 39. The Refractive Index of a Substance in the Form of a Prism.--Snell's law is the basis of most methods for the determination of refractive indices. The above expression of the law is often written n = i, (133) sin r where n is the index of refraction of the second medium relative to the first, i is the angle of incidence and r is the angle of refraction. Starting with this equation, a formula will now be deduced for the determination of the refractive index of a substance in the form of a prism of known refracting angle. In Fig. 72, consider light incident on the prism of refracting angle A at an angle of incidence i. On entering the prism, the angle of refraction is r. At the second face, the angle of incidence is represented by i', and on emergence into the air the angle of refraction is r'. At the point of emergence draw a line parallel to the ray incident on the first face. The angle S between this line and the emergent ray is the deviation produced by the prism. From the geometry of the figure, the deviation 5 = a + p. But a = a' = i--r and /S = r'--i', so that 5 = i-r + r'-%'. (134) But r + %' = - = A. (135) Cons...Hide synopsis

A Handbook of Physics Measurements, Volume 1... – Trade paperback
(2011)
by Ervin Sidney Ferry, Oscar William Silvey (Creator), George William Sherman (Creator)

Description:New. Trade paperback (US). Glued binding. 264 p. Intended for a...New. Trade paperback (US). Glued binding. 264 p. Intended for a juvenile audience.

Description:New. Trade paperback (US). Glued binding. 266 p. Intended for a...New. Trade paperback (US). Glued binding. 266 p. Intended for a juvenile audience.