Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 642
little nearer the lens than the focus;but if the eye be, placed very near the lens, ten inchesdivided by the focal length may be taken as an approximatevalue of the magnifying power of a simple microscope. 561. Galilean Telescope. — The principle of the telescopeseems to have been first discovered… … 632 THEORY OF OPTICAL INSTRUMENTS. which would enable an observer to see a distant object withthe same distinctness as if it were at only a small fraction ofits real distance. Soon after his return to Padua, where heheld the position of professor of mathematics, he attackedthe problem…
Physics
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