Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 67
son of ordinary vision gains by the assistanceof a convex lens which shall enable him to see at the same distancewith equal distinctness. It is, evident therefore, that the magni-fying power of a single lens, depending as it does upon the propor-tion between the distance at which it renders the… … Diagram illustrating the action of the Simple Microscope; a b object;A B its magnified image. many times the focal length of the lens is contained in ten inches ;-since, in order to render the rays from the object nearly parallel, itmust be placed nearly in the focus of the lens (Fig. 3); and…
Microscopy · Biology
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