Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 368
near at hand would be brought to a focusbehind the retina (§§387, 388). But when we wish to see aii*objectclose at hand we involuntarily alter the curvature of the surfaces—chiefly the forward surface—of the crystalline lens, making it moreconvex, so that the image is brought upon the retina and we… … 358 OPTICAL INSTRUMENTS In order to see an object distinctly we naturally bring it near tothe e3e. As it approaches, our vision of it improves until it getswithin a certain distance, and then we liave to strain the eye to seeit clearly, and when it gets too close the image is blurred. Theshortest…
Physics
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