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 34
ect (thoughlarge) and the nearer it approaches the principal focus (). On thecontrary, if the object is brought very close to the focus its image willbe formed at a definite distance and will be greatly magnified (). Let us suppose in the second place that the object A B is placedbetween the lens… … AD and BE (fig. 21), these rays after being refracted emerge fromthe lens, diverging more and more from the secondary axes; but ifthese rays are produced backwards, cutting the same axes at the points A and B, they will form there the virtual image of the points A and B ; all the other rays…
Microscopy
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