Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 332
he mediumthrough which they came. Perhaps the most familiar ex-ample of this is the effect produced by the ordinary mirroror looking-glass ; thelight passes from objectsin the room to the mirror,and is reflected by themirror into the eye. If a beam of sunlightis allowed to enter adarkened room… … Fig. 194. 318 LIGHT [§§ 524-527 524. Rays. — The word ray is used for convenience,to indicate the |?a^7i along which the front of any wavetravels. It does not refer to any portion of the wave, butsimply to the line of direction of any particular portion ofthe wave-front. The term is used mainly…
Physics
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