Common objects of the microscope [electronic resource] (1900)
Wood, J. G. (John George), 1827-1889, West, Tuffen, ill, Bousfield, E. C. (Edward Collins), b. 1855 · London : G. Routledge & Sons · leaf 28
an image 8 CONJUGATE FOCI of the sun, or of any other distant object, upon ascreen, such as a piece of smooth white cardboard.In the figure this distance will be PL. Conversely,if the source of light be at P, a parallel beam oflight will be-emitted from the lens. The focal length may, however, be… … Fig. I. the lens, inverted in position, but of the samedimensions as the original object. The object andimage then occupy the equal conjugate foci of thelens, so that by causing them to assume theserelative positions, and halving the distance atwhich either of them is from the lens, the focallength…
Microscopy
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