Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 126
hanging the shapeof the lens and, therefore, itsfocal length. The muscles ofthe eye make the crystallinelens more convex when we viewan object near at hand and lessconvex when we view one at adistance. cept that which comes throughthe lens. The colored part ofthe eye is the iris and the open-ing in… … Fig. 191. The reason for the use of spectacles From Lyndes Physics of the Household,published by The Macmillan Co. 124 GILBERT BOY ENGINEERING Spectacles. The eyes of short-sighted people focus the lightin front of the retina F, Fig. 191 A, and this difficulty is overcomeby spectacles with…
Light · Scientific recreations
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