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 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 inward… … the eye would see the arrow BC under the an-gle bi\.c. But the rays BF and C G, from theextremities of the arrow, in passing through thelens are refracted to the eye in the directions_/A, gA, which makes the arrow to be seen underthe much larger angle D A E, the same as theangle /A g. Therefore the…
Encyclopedias and dictionaries · Aeronautics
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