Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 38
Fig. 13.- A radiant at the principal focus of a biconvex lens makes the refracted rays parallel. … Fig. 11.—A radiant placed beyond the principal focus causes rays to convergebeyond the principal focus on the other side of the lens. on the other side of the lens (i.e. twice the focal length from the lens).In other words, when the object and its image are equidistant oneither side of the lens,…
Microscopy
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