Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 104
ed, without at tlie same timeincreasing the angular deviation of the rays transmittedthrouofh the edges of the lens. The size of the imagecorresponding to a given angular diameter of the objectis in the direct proportion of the focal length, while theflexure of the rays which converge to form any… … Fig. 42.—Diagram Showing tlie Amount of Colour Produced by a Leas. they are deviated, and it will be seen by reference toFig. 42, that if the red rays are at R, and the blue at b,the distance A b is fifty times R b, and as these distancesdepend on the diameter of the lens only, w^e can increasethe…
Astronomy · Telescopes
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