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 403
row lemniscate-shaped region at F„, the secondaryfocal line, at right angles to the primary focal line. The second refractingsurface of the lens will modify but not change the general character ofthis result. 450. Cylindrical Lens. The effect of such a lens is like that of a cylin-drical mirror. A… … T.+ : = (- ■(^■,) Fig. 262. and may be either real orvirtual; the other, AB isvirtual and is as far behind the lens as the image given by a parallel-sidedplate of the same thickness as the lens. Any lens with different curvaturesin planes at right angles to each other will give similar focal lines…
Physics
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