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 401
only the central portion of the incident pencil to passthe spherical aberration will be greatly reduced. It is also pos-sible to grind surfaces slightly differing from a spherical formso that for a given pair of conjugate focal distances the emer-gent wave is truly spherical. Such lenses are called… … Fig. 259. plano-convex lens of great aperture (Figs. 258, 259) first \\i.xhthe plane then with the convex face toward a source so distant LENSES. 38; that the incident light is parallel or nearly so. If we considerthe deviation of the ray PQ in each case, it is evident, on re-calling the condition…
Physics
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