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 171
168 LENSES. … hollow surface, cither in passing from or into the lens,there will be an equal divergency from both sides ofthe double coucave lens a b ; and those rays, whichwould have di-verged in aplano-concavelens as coiningfrom c, nowdiverge withthe additionalconcave side,as if they is-sued from the virtual…
Physics
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