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 388
s made clear why the depth of a pond appears to be lessthan it actually is, and why objects immersed in water appear tobe shortened. Since the indexof refraction is about 1.33,a pond six feet deep seemsto be only about four and ahalf feet in depth. If the cone is wide thereis considerable… … Fig. 242. but may be made evident by using a large condensing lens ofsmall focal length, which will take in a large divergent pencil. 372 LIGHT. sr-
Physics
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