Natural philosophy. being a hand-book of chemical physics, or, The physics of heat, light and electricity (1869)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 117
n passing through the lens;and convergiugrays, </,»,/.-•, falling on thesurface r s v, emerge ou the other side asparallel rays, e, h,f. 275. Convex lenses are proved by the laws of refraction topossess the following properties : I. Every principal ray that falls upon a convex lens of…
Physics
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