Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 384
the lens as the object. Hence, t?ie image ofan object placed nearer the lens than the principal focus isvirtual, magnified, and erect, as shown in Fig. 275. A convexlens used in this manner is called a simple microscope. 326. Simple microscope. As its name implies, the micro-scope is an instrument… … B Fig. 275. The magnifying power of the lens is simply the ratiobetween the apparent diameter of the image and the diameterof the object, e.g. AB: AB (Fig. 275), or it is the ratiobetween the visual angles under which the eye would seeimage and object, if both were placed at the distance ofdistinct…
Physics
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