Introductory course of natural philosophy for the use of schools and academies. Ed. from Ganot's popular physics. By William G. Peck (1869)
Ganot, Adolphe, 1804-1887, Peck, William Guy, 1820-1892 · New York A.S. Barnes · leaf 312
and Fig. 202 a section or profile of anechelon lens. A lens of this kind consists of a plano-convex lens, A. about a footin diameter, around which are disposed several annular lenses, whichare also plano-convex, and whose curvature is so calculated thateach one shall have the same principal focus… … Fig. 203. Explain Vie reflectors used hy Fresnel. 310 POPULAR PHYSICS,
Physics
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