Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 275
. The point at which raysparallel to the principal axis converge (or from which they ap-pear to diverge) is called the principal focus of the lens. Thedistance from the center of the lens to the principal focus iscalled the focal length of the lens. Images formed by a convex lens. — A convex lens… … FIG. 189. — Real image formed by a convex lens. image. This is illustrated in Fig. 189. The line 01 is the prin-cipal axis. F and Ff are the principal foci. The object is OB andthe real image is IM. All the rays from B which fall on the lensconverge at M. Thus M is the image of the point B. The…
Physics · Home Economics
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