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 29
r appearsbent, the immersed part appearing raised. Owing to refraction stars are visible even whenthey are below the horizon. MOTION PICTURES 2,683 that n sin BOG = 1, from which, sin BOG = l~/x. This angleBOG is the critical angle. The critical angle varies with the nature of the substance: thus,… … Fig 3,776.—Construction of refracted ray. Let AO be a ray of light passing through air andentering water at O. The index is f. Draw two circles with centers at O and with radiiwhose lengths are as 4 : 3. Draw AI and BR perpendicular to the normal NN. Since AO :BO =4:3, then AI : BR =4:3. Hence if…
Electrical engineering
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