The microscope; an introduction to microscopic methods and to histology (1901)
Gage, Simon Henry, 1851-1944 · Ithaca, N.Y. Comstock publishing company · leaf 17
d be seen that there is a principal focuson the other side, that is there are two principal foci, one on each side of the lens.These two foci are both principal foci, but they will be equally distant from thecenter of the lens only when the curvature of the two lens surfaces are equal.There may be… … Fig. 12.—Double Convex Lens, Showing Chromatic Aberration. The ray of white light (w) is represented as dividing into the short waved, blue s(b) and the long waved, red (r) light. The blue (b) ray comes to a focus nearerthe lens and the red ray (r) farther from the lens than the principal focus…
Microscopy
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