Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 163
the angle of incidence. The angleh b g, which is formed by the line of refraction andits axis, is the angle of refraction ; k g is its sine;and the angle g b f, which is the difference betweenthe angles of incidence and refraction, is called theangle of deviation. It may be practically found, by… … A piece of money beingplaced at the bottom of thecylindrical vessel o r, let theeye of the observer be soplaced at n as just to losesight of the object at p, orso that a ray shall pass fromthe remote part of tht pieceto the eye in the directionpo n. Whilst the eye continues in this situation, ifthe…
Physics
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