Carhart, Henry S. (Henry Smith), 1844-1920 · Boston : Allyn and Bacon · leaf 282
REFLECTION AND REFRACTION. 271 … the angle A OA is measured by the circular arc AA. To find the conditions under which this shall be a minimum, we must ascertain what position of the constant angle ABA will give the shortest arc A A. Let ABA and aBa (Fig. 132) be two consecutive posi tions, BA and Ba being greater than BA and Ba.…
Physics
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