Astronomy for schools; upon the basis of Mons. Arago's lectures at the Royal observatory of Paris .. (1841)
Arago, F. (François), 1786-1853, Haskins, Roswell William, [from old catalog] ed · New York, Robinson, Pratt & co.; · leaf 22
explain to us the formation of ima-ges, in this way. Take, first, the plane mirror; suppose, fig. 1, S theradiant point, O the eye of the observer, and A Bthe plane reflector. Among all the luminous raysemanating From S, there will be one of them, as S I,which, after being reflected, by the mirror,… … S A, which encounters, at A, the reflecting surface;and if we prolong this perpendicular, upon the oppo-site side of the mirror,by the quantity A D,equal to S A: then, fromthe point D, draw the lineD O, to the eye; DOwill be the direction ofthe reflected ray, and theB point I, where it cuts…
Astronomy
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