Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 43
sumption thatrays emitted from a single point intersect also after refractingin a single point is virtually correct with a lens whose aperture,that is, the angle obtained by joining the edges to the principalfocus, does not exceed 10° or 12°. Ques. What is the effect of a larger aperture? Ans. The… … rocus of intermediate: rays Fig. 3,807.—Effect of spherical aberration: it produces a lack of sharpness and definition ofan image. If a ground glass screen be placed exactly in the focus of a lens, the image of anobject will be sharply denned in the center but indistinct at the edges, and if sharp…
Electrical engineering
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