Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 379
a short time,it will take lire. The reason is apparent why convex lenses aresometimes calledburning glasses.A pencil of rays,emitted from theprincipal focus F(Fig. 268) as aluminous point, be-comes parallel onemerging from a convex lens. If the rays emanate from apoint nearer the lens, they diverge… … Fig. 270. CONJUGATE FOCI. 361
Physics
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