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 414
different thickness, andwill be brought to a focusat a different point on theretina. To get a general expressionfor the difference of path, let n be the index of refraction of the film, «ithat of the surrounding medium, and for simplicity imagine the two sur-faces to be parallel. To reach the wave… … d = n(AB + BC) — ti.AP.But AC sin i = AP ; AC sin r = CQ ; therefore, sin t AP = CQ CQ 398 LIGHT.
Physics
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