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
ot 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 all mirrors which give satis-factory images x may be neglected in comparison with r, or cos… … Fig. 229. REFLECTION. 361 radius r. The waves incident on the mirror have a radius ofcurvature u, with a sagitta AB. Reflection begins at M and A^while the vertex of the wave has still to travel the distance BDbefore reflection begins. When the vertex reaches the mirror theedges of the wave have…
Physics
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