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 162
is transmit-ted obliquely through different mediums, such as air,water, glass, or any other transparent body, as itenters into each, it changes its direction, incliningmore or less to the perpendicular of the medium, ac-cording to the density of the body. This deflection(usually called refraction)… … course, and draws them towards the axis of the me-dium. When rays fall perpendicular, they have norefraction. due represents a vessel fill-ed with water, or any transpa-rent body denser than air, andd b e is its surface. The linea b is the course of the ray oflight from the object or radiantat a,…
Physics
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