Lockyer, Norman, Sir, 1836-1920 · London : Macmillan and Co. · leaf 245
-52. By an effect of refraction the stars appear tobe higher above the horizon than they really are. InFig. 42, A B represents a pencil of light coming from astar. In its passage through our atmosphere, as eachlayer gets denser as the surface of the Earth is approached,the ray is gradually… … Fig. 43.—A Prism, showing its action on a heam of light. called a prism. If we take such a prism into a dark room,and admit a beam of sunlight through a hole in the shutter,and let it fall obliquely on one of the surfaces of theprism, we shall see at once that the direction of the rayis entirely…
Astronomy · Solar system
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