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
lens, or AB 447. Spherical Aberration. In deriving the formula for theconjugate focal relations of lenses it has been tacitly assumed thatthe emergent wave is spherical. With lenses of small aperturethis is shown by experience to be practically true; but when theaperture becomes large there is… … Fig. 257. It is evident, therefore, that the edges of the emergent wave (representedby the dotted curve) will pass through O instead of N, and have a greatercurvature toward the axis than if the wave were spherical, with S^ asa center. The rays instead of converging to S^, as shown in the lowerhalf…
Physics
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