Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 547
incipalfocus—does not exceed 10° or 12°. Where, however, the aperture is larger, the rays which traverse the lensnear the edge are refracted to a point F nearer the lens than the point G,which is the focus of the rays which pass near the axis. The phenomenonthus produced is named spherical… … Fig. 512. 530 On Light. [558- Spherical aberration is prejudicial to the sharpness and definition of animage. If a ground glass screen be placed exactly in the focus of a lens, the image of an ob-ject will be sharply-defined in thecentre, but indis-tinct at the edges;and, vice versa, ifthe image is…
Physics
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