Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 121
109. Real and Unreal Images.—If the rays of light pro-ceeding from a point are by any means really broughttogether again at a different point, as in Fig. 79, then thesecond point is called a real image of the first. A realimage has an actual existence in space, and will show as apicture upon a… … Fig. 70. unreal, or virtual, image of the first. A virtual image hasno real existence in space, and would not show upon a screenplaced where it appears to be. Evidently the image formed by a plane mirror is an un-real image. 110. Images of Images.—If any of the rays from 0 (Fig.71) after reflection…
Physics
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