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 308
ses. 302. Concave lenses being thinner in the middle thanat the edges, have the effect to diverge parallel rays. If therays are already divergent, these lenses make them stillmore so. This is shown in Fig. 198, in which a pencil of rays, coming fromthe radiant, L, arc made to diverge, as though… … Fig. 19S. From what has been said, it is plain that the imagesformed by concave lenses are virtual. * They are also erect,as in Fig. 198. The course of the rays, in forming an image in the caseof a concave lens, is shown in Fig. 199. In that figure, ABrepresents the object. A pencil of rays, coming…
Physics
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