A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures (1848)
Quekett, John, 1815-1861 · London, H. Bailliere · leaf 184
us at F, this would take place if the lens wereperfect; but it is found in practice, that instead of meeting ina single point F, the rays are subject to two different causesof error or aberration: the first is called the spherical, thesecond the chromatic aberration; and as no lens can be… … 100. Fkr. 101. lens with a spherical surface can bring the rays of light issu-ing from one point into the focus at another point, all must be subject to what istermed spherical aberra-tion, as shown in fig. 101,where LL, &c, repre-sent five parallel rays oflight, the two outer ofthese will be…
Microscopy
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