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 397
nverging surface, negative when it refers to a divergent surface. Thismay be illustrated by deriving the conjugate focal relations for a doubleconvex and for a double concave lens. Assuming a to be so small that PR = PQ (Fig. 253) AB+BC+CD+DE(path of edge of wave in air) = {BC -\- CD) (equivalent… … 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…
Physics
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