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 165
he plane, it is reflected from the surface, and passes in the direction f e,making the angle of reflection e f d exactly equal tothe angle of incidence c f u. Consequently, Parallel rays falling on a \c \g /e /h plane mirror still keep parallelafter reflection ; for as the an-gle of incidence is…
Physics
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