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
f convexity of the double convex lensa, b, c- After passing through the lens, the raysgo on parallel to each other in the space C D.If the lens had been plano-convex, the radiantpoint for this jiurpose must have been at B, orat twice tlie distant-e of A from B. 387. Rays diverging from a radiant… … B, and A is the radiant point from which thelays «,/*, c, &c., diverge. After passing throughthe lens they will converge and meet in a focalpoint, as at C. The farther A is from B the nearerwill C be to it. 388. Rays diverging from a radiant point be-tween a convex lens and its focus will…
Encyclopedias and dictionaries · Aeronautics
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