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 377
f the center of curvature and the conjugate focal rela-tions for spherical mirrors a very simple mathematical relationis all that is required. 36o LIGHT. 421. Relation between Radius of Curvature and Sagitta of Arc. ,A Consider the arc/i5, with centerof curvature C, and radius r(Fig. 228). The… … Therefore, 2rx — x = y- r r 2r — X r(l-|-cosa)It is found that if the angle a is very small, not more than two orthree degrees, the mirror will give a well-defined image. If the angularaperture 2a of the mirror is greater than four or five degrees sphericalaberration becomes noticeable (§ 427). For…
Physics
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