Duff, A. Wilmer (Alexander Wilmer), b. 1864, ed, Guthe, Karl Eugen, 1866-1915, Hallock, William, 1857-1913, Lewis, E. Percival (Exum Percival), 1863-1925, Goodspeed, Arthur W. (Arthur Willis), b. 1860, Carman, Albert Pruden, b. 1861, McClung, Robert Kenning, 1874- · Philadelphia, P. Blakiston's Son & Co · leaf 389
ion of pairs of such rays will fixthe position of the desired foci or centers of curvature of thewaves. 434. Deviation—Minimum Deviation. The total deviation of agiven ray is D =^D^-\- D,(Fig. 244). But r^-\-r2 = A, since B■\-A = 180° = 5 -f r, + r,. Therefore, D=^\-\-i^ — A Fig. 244. It is easily… … Therefore, r, = r, = A/2 sm r . A sin — 2 REFRACTION AND DISPERSION. 171 This relation is commonly used for determining the index ofrefraction of substances in the prismatic form. As the index isnot the same for different colors, it is evident that the prism canset at the angle of minimum deviation…
Physics
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