Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 250
Fig. 108.—Double images seeu through Icelaud spar. or other double refracting substance, it is divided up intotwo portions, one of which is refracted more than theother. If we trace the rays proceeding from a point s, Fig. … Fig. 109.—Diagram showing the path of the ordinary and extraordinary rays iua crjstal of Iceland spar, producing two images apparently at E and o. 109, we find one portion of the light reaching the eye ismore refracted at the surfaces than the other, and conse- Q 2 228 STARGAZING: PAST AND PRESENT.…
Astronomy · Telescopes
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