Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 117
tlane mirror, that rays falling on the miiTor at these 94 STARGAZING : PAST AND PRESENT. [book ir. points will be reflected so that the angles on either sideof each of these lines shall be equal; so, for instance, inFig. 49, we wish to find to what point the upper ray willbe reflected, and we draw… … Fig. 49.—Convergence of Light by Concave Minor. point where it falls on the mirror, and then draw anotherline from that point making the angle of reflection equalto that made by the incident ray, and we can considerthe small surface concerned in reflection flat, so that theray will in this case be…
Astronomy · Telescopes
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