ither concave or convex. 83-84] LENSES. 133 (a) Let P, fig. 101, be a point to which a pencil of raysis converging, and let the pencil fall on a concave lens. Twocases occur depending on the position of the lens. (i) Suppose P be at a greater distance from the lensthan its focal length. Consider a… … Fig. 101. of the lens. This ray travels on without deviation. Let RRproduced backwards meet it in p. Then rays converging to Pappear after refraction to diverge from p and a virtual imagepq is formed of PQ. (ii) Suppose P to be nearer the lens than its principalfocus. The same construction will…
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