The microscope : its construction and management : including technique, photo-micrography, and the past and future of the microscope (1893)
Heurck, Henri van, 1838-1909 · London : C. Lockwood ; New York : D. Van Nostrand Co. · leaf 37
ichthey are parallel, and there form a focus. For examplelet two parallelrays C D andE F strike thebi-convex lensAB (fig. 26).These rays aredecomposed inthe lens at thesame time thatFig. 26. they are re- fracted, and upon emerging, each of the colours of which whitelight is composed, will form its… … ABERRATION OF REFRANGIBILITY—ACHROMATISM. 17 If now objects are observed through such a lens, it will be noticedthat their outlines are not sharply defined, and that they are tintedwith all the colours of the spectrum, which is naturally a greatinconvenience. It was thought for a long time that it…
Microscopy
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