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 434
ical aberration is reduced by using plano-convex lenses with convex surfaces facing each other. In all these eyepieces the emergent red and violet rays are nearly parallel,hence the virtual images formed by the different colors subtend verynearly the same angle at the eye, and are therefore of the… … combination of lenses is used. An enlarged real image AB(Fig. 298) is formed by an object lens or train of lenses, and28 4i8 LIGHT.
Physics
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