A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)
Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 268
in which A is the radiating point from which therays «, b, c. Ike, diverge, and F is the focus ofthe lens B. These rays, after passing throughthe lens, continue to diverge in the space C D.389. The focus of the suns parallel rays, whentransmitted through a double convex lens, isshown in the annexed… … meet in a focus or pointtre of the lenss convex!diverge to t!ie contraryThe middle ray d, fallingsurface of the lens at D,passing through it. 390. A convex glassvision ; the reason is this «> l>, c, d, e, f, falling obliquely on the surfaceA D of a double convex lens, are refracted orbent…
Encyclopedias and dictionaries · Aeronautics
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