Lummer, O. (Otto), 1860-1925, Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · London, New York, Macmillan and Co., 1900 · leaf 111
eet away from the camera, the rule that governs the action of lenses in the case of magnifying glasses and micro- scopes works in the reverse way. The more powerful the lens — that is, the shorter its focal length — the less does it magnify. To produce larger pictures of distant objects we must use… … Fig. 41. — Diagram illustrating Relation between Focal Length and Size of Image. Suppose a distant object AB (Fig. 41) is being photographed through a lens L which has a short focal length, requiring the plate to be put at P^. Then by drawing the lines B& and Aa through the optical centre of the…
Photographic optics
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