ct formed byrefraction through a lens. If an eye be placed at a suitable distance from a lens andin such a position that a pencil of rays diverging from a pointon the image may enter it, the image formed will be seen bythe eye. The course of the rays by which vision is producedin various cases is… … Fig. 98. Draw the conical pencil of rays proceeding from p to fillthe pupil of the eye and produce the rays back to meet thelens in RR. Join R R to P. Then a conical pencil divergingfrom P is made by the lens to converge to p, and on divergingthence enters the eye and produces vision; the eye sees…
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