Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 213
und at B. The image is thenbeyond the principal focus F, is inverted, real and diminished*This may be reversed, that is the object may be placed at AB\where the image now is. Then the image will be at AB, enlarged.This is the principle of Lantern projections. 708. II. The Object nearer the Lens… … ♦The principle of the telescope, Sec. 719. 204 OPTICS. and they will meet the axes at A and B\ The image isnow on the same side of the lens as the object, is direct, en-larged, but virtual* 709. Foci of Concave Lenses. Concave lenses give onlyvirtual foci. Fofcus of Parallel Rays. The focus is…
Physics
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