Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 375
852 RADIANT ENERGY. — LIGHT. Fig. 265. … convex lenses in to converge transmitted rays; and of concavelenses, to cause them to diverge. Incident ra3-s parallel with theprincipal axis of a convex lens are brought to a focus F (Fig. 265)at a point in the principal axis. This point is called the prin-cipal focus, i.e., it is the focus of…
Physics
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