Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 96
ar object, so the use of convex and concavelenses placed close to the eye is to render divergent orconvergent rays nearly parallel, so that the eye-lens caneasily focus them, and therefore one of the conditions ofthe telescope is that the rays which come into our eyeshall be parallel or nearly so.… … Fig. 37.—Galilean Telescope. A B, convex lens converging rays ; c d, concavelens sending them parallel again and fit for reception by the eye. a concave one, diverges them, and renders them parallel,ready for the eye ; the rays then, after passing through( D, go to the eye as if they were…
Astronomy · Telescopes
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