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 433
M of the retinal image is, therefore, a/^. If /is the focal length of the lens, d the limit of distinct vision AB=^2d-i2.r\ ^/2 = 2/ tan a/2 Therefore, if these angles are small M^a/p = d/f 475. Eyepieces. The part next the eye of an optical train oflenses, such as those of telescopes and compound… … Fig. 296. the eyepiece would be lost. In order to avoid this, light isgathered in toward the axis by a second lens, called the field lensF (Fig. 296). Nearly all the light would pass by the edge of theeye lens E \i F were absent. It may be shown that a com-bination of two lenses of the same kind of…
Physics
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