Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 281
laced near the lens. In this case, the distance of the imagobehind the lens is greater than the distance of the object be-fore it. By altering the distance of the object, the size of theimage may be reduced or enlarged. The hemispherical lensL M N,fig. 148., is particularly adapted for the… … is a concave mirror M N, the vertex of which is opposite tothe centre of the flame, which is placed in its focus. In theopposite side of the lantern is fixed a tube A B, containing ahemispherical illuminating lens A, and a convex lens B; hetween A and B the diameter of the tube is increased ior the…
Optics
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