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 49
the screen, determinethe size of the image. Ques. At a given distance how does the size of theimage on the screen vary with the focal length? MOTION PICTURES 2,703 Ans. The greater the focal length the smaller the image.Accordingly short focus lenses give large images. Ques. What precaution should…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
