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 33
le LBN, greater than the angle SBN, hence, after traversing the lens, theray cuts the axis at a point L, which is more distant than the principal focus F. As allrays from the point L intersect approximately in the same point L, this latter is the con-jugate focus of the point L. This term has the… … -4W Fig. 3 789.—The virtual focus. If a source of light be placed at L, between the principal focusF* and the mirror, any ray LM emitted from L, makes with the normal CM, an angle ofincidence LMC, greater than FMC. The angle of reflection must be greater than CMS,and therefore the reflected ray ME…
Electrical engineering
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