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
A, every ray AC, after having been twice refracted,diverges from this axis on emerging, since the point A is at a less distancethan the principal focal distance (552). This ray, continued in an oppositedirection, will cut the axis Oa in the point a, which is the virtual focus of thepoint A. Tracing… … -558] SpJierical A berration. There is, therefore, an image of Al) at ab.erect., and larger than the object. The magnifying power is greaterconvex, and theobject nearerthe principalfocus. We shallpresently show-how the magni-fying power maybe calculatedby means of theformula? relatingto lenses…
Physics
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