Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 444
on and therebyincreases the flatness of the field. The images o 6 and a b (Fig. 323)are in reality curved in consequence of the spherical aberration COMPOUND MICROSCOPE. 425 caused by the objective. The effect of the field lens is to correctthis curvature in a measure. 2. The combination increases… … FlG. 323. matic objective. This consists of two to four achromatic lenses,(the achromatic triplet, the most common form, is represented onan enlarged scale at L in Fig. 323), combined so as to act as asingle lens of short focus. By the use of several lenses, the aber-rations can be better corrected…
Physics
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