Lockyer, Norman, Sir, 1836-1920 · London : Macmillan and Co. · leaf 250
he image is of exactly the samesize as the shilling. So much for the action of a singleconvex lens. ■462. Now, if instead of arranging the prisms as shownin Fig. 44, with their bases together, we place them, pointto point, it is evident that the rays falling upon them willno longer converge, or… … Fig. 47.—Shuwing tlie action of a Bi-Concave Lens on abeam ofparallel rays. and the shape of any section of such a lens and its actionare shown in Fig. 47. 463. In some lenses one surface is flat, the other beingeither concave or convex ; so besides the bi-convex andbi-concave, already described,…
Astronomy · Solar system
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