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 25
ced between C and the principalfocus, the conjugate focus will be carried over to the other side ofC, so that the conjugate focus of the point F will be E. At the principal focus a conjugate focus is found situated at infinity,the reflected rays being parallel; between the former point and the… … REFRACTION. J very simple ; it is placed so as to receive a beam of solar rays ina direction parallel to its principal axis, and, by presenting a whitecard before it, the distance at which the image of the sun thusobtained appears plainest, is found. This point will be the principal focus, and…
Microscopy
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