Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 340
pens that all such parallel rays after reflection crosseach other at nearly the same point. This point is at pin the figure; it is called the principal focus^ and italways lies midway between the centers of curvature andof the mirror. Hence, in order to follow the course of a second ray,we have… … Fig. 202 537. Cause of Images.—Not only may the image bethrown on a screen in the manner suggested, but, if theeye is properly placed, the image will be seen at the sameplace if the screen is removed. Or, wherever the eye maybe placed, as already suggested, images will be seen ofsurrounding bodies.…
Physics
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-394-273.webp)
