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 399
M= 00, v = f, the principal focal distance. When M > /, ji is positive and there is a real conjugate focus. When u = f, v= CO. The transmitted beam is parallel. When u <if, V is negative and greater than u for all positive values of u,and there is a virtual conjugate focus. When / is… … Fig. 255. optical center, which has the property that no ray passing throughit is deviated in direction, although there is more or less displace-ment, depending on the thickness of the lens. The existence of this point may be shown thus: Let two parallel radii ofcurvature r^ and r2 (Fig. 255) be…
Physics
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