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 398
Fig. 253. LENSES. 381 Therefore, AB—DE = —(n—i)(BC + CD) By applying the same method to the other types of sphericallenses it will be found that the general solution of all cases is theformula U V f The sign of / (which depends on the sign of r^ and rj) is positive forconverging lenses and negative… … Fig. 254. (§ 423). The sign of v will take care of itself, but it may be written withthe positive sign. ui M J The following cases arise when / is positive: When 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…
Physics
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