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 41
the objectis at the principalfocus, the rays afterpassing through thelens will be parallel,and no image will beformed. MOTION PICTURES 2,695 Ques. Describe image formed when the object is be-tween the principal focus and the lens. Ans. The image is virtual, erect and larger than the object.In this… … Fig. 3,805.—Formation of virtua Hmage in double concave lens; no real image is formed withthis type of lens. Let AB be an object placed in front of the lens. If the secondary axisAO be drawn from the point A, all rays AC, AI, etc., from this point are twice refracted inthe same direction, diverging…
Electrical engineering
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