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 170
in proportion to their dis-tance from the axis of the lens. Let the rays fall onthe flat side of the lens : & after having passedthrough the denser me-dium of the glass, theywill diverge on the op-posite side as they passinto the rarer medium ofthe air, and the ray g a will be refracted from…
Physics
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