A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 629
f/11, and //8, the diameters being 6?_j _if) ^..., etc., of the focal length of the lens, because 64, 45, 32, 22, 16, 11, and 8 are the nearest whole numbersthat would make d2/f2, and therefore the brightness of the image,proportional to, ]; 2, 4, 8, 16, 32, and 64. On this system, exposure tables,… … FIG. 556.—Arrangement of lenses in a projection lantern. real image. Thus the lens L (Fig. 556) produces an image of thetransparency O upon the screen I. Since O is near the principalfocus of L, the image is large (p. 595), and if the screen be of suitablewhite material, the image may be exhibited…
Physics
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