Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 228
enses there are four forms,three of which ,are shown at i 2, 3, in Fig. 204; i being adouble convex lens, 2 a plano-convex, and 3 a convex menis- LIGHT. 205 cus. The fourth form, which is a double convex with curvedsides of different radii, is known as a crossed lens. Of diverging or diminishing… … Principal Focus of a Convex Lens. fracted, and on leaving the lens the) are again refracted sothat they all converge at the point F, which is the principalfocus. The focal length of the lens is the distance from thelens to the focal point. When Kght proceeds from a point and is rendered con-vergent…
Physics · Lantern projection · Electric apparatus and appliances
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