Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 134
this image is CHAP. IX.] EYEPIECES. Ill viewed by the eye-glass, A, it no longer appears coloured,for tlie ray v, falling nearer the axis of A, is less bentthan r, and they are rendered nearly parallel and appearto proceed from the point f where the whole imageappears without colour. In order to… … Fio. 61.—Diagram Explaining the Achromaticity of tlie Huyghenian Eyepiece. The next eyepiece which comes under considerationis that called Kamsdens, Fig. 62. It consists of twoplano-convex lenses of the same focus, A and b, placedat a distance of two-thirds of the focal length of eitherapart; they…
Astronomy · Telescopes
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