The outlines of physics: an elementary text-book (1897)
Nichols, E. L. (Edward Leamington), 1854-1937 · New York, The Macmillan Company; London, Macmillan & Co., Ltd. · leaf 391
ll not convergeto any focus in front of the mirror after reflection, but willdiverge, as shown in Fig. 348. These divergent rays, ifwe imagine them produced behind the mirror, will, how-ever, come to focus so as to form a virtual image at i.This image, like the image in the plane mirror, will… … may be determined from the direction of the reflectedrays. The intersection of the paths of these behind themirror indicate the position of the image.
Physics
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