Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 171
the rays issuing from it willfall upon the glass and converge to the focal point;whence the image will appear inverted, but clear anddistinct, as if the object was placed there in the sameposition. The image removes further from the lensas the radiant approaches ; so that when it is broughtwithin… … rays d a and d b issuing from the point d, will be re-fracted at a and b, and converge to e, and form oneextremity of the object; in the same manner c a andc b, in passing from c, will converge to f, the otherextremity ; then if we conceive an infinite number ofrays passing from every other point…
Physics
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