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 36
ng lenses is identical with that which we havegiven (page 3) for spherical mirrors, and this unequal deviation fordifferent parts of the lens is called spherical aberration. Spherical aberration is a serious defect, which the optician tries toremove as far as possible by different combinations.… … draw the rays C A and C B so as to just graze the edges, anddraw other rays C D and C E very close to the principal axis (fig. 25). When these rays traverse the lens we find that C D and C Eform their focus in F, while A C and C B form theirs in F, situated infront of F. If from the point C, other…
Microscopy
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