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 26
Figs. 3,771 and 3,772.—Concave spherical mirror; definitions. In the diagram V is the vertex;MM, the aperture; CVf the principal axis; CS, a secondary axis; C, center of curvature;F, principal focus (midway between V and C). Any line drawn from C to the mirror will beperpendicular to the mirror at…
Electrical engineering
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