Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 85
Fig. 26.—Double Convex, Plane Convex, ami Concavo-Convex Lenses. electric lamp are generally rendered parallel by means ofthe lenses in the lantern, called the condensers, the raysfrom such a lamp ftilling on a convex lens will come toa focus at just the same distance from the lens, called … Fig. 27.—Convergence of Rays by Convex Lens to Principal Focus. its principal focal length as they would do if they camefrom the sun or stars. So far we have l)rought rays to a focus, and on holding CHAP, v.] THE REFRACTION OF LIGHT. 03 a piece of paper at the focus of the convex lens, asjust…
Astronomy · Telescopes
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