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 31
7); on again entering the air they experience another deviation towards this axis, which they intersect at the point Pj„ I7- C. Since all the parallel rays intersect at this same point, it will be the principal focus of the lens. The principal focal length is the distance of the focus from… … OF LENSES AND THEIR PROPERTIES. of the metrical system), lens No. 5 is one whose principal focusis at a distance of five inches from the optical centre. point A (fig If luminous rays proceed fromprincipal axis, and meet the lens in the form of the same thin
Microscopy
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