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 442
Fig. 309. … M, m; Fig. 310. that about one half of the incident light is reflected. Light from the point6 of an extended source falls on this surface at A and is in part trans-mitted to the mirror Mi, in part reflected to the mirror A/;. From these
Physics
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