Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 356
per amount of light mayenter. The crystalline lens C is located immediately behind theiris, in the center of the opening. It is double-convex inform, and serves the purpose of converging the rays oflight and forming upon the retina an image of the objectviewed. The retina i2 is a screen at the back… … 342 LIGHT [§§ 568-571 568. The Crystalline Lens. — This lens is not onlydouble-convex, but it is so constructed that the amountof convexity may be changed at will, to a limited extent;that is, it may be flattened or thickened. This decreasesor increases the convergence caused by the lens, so…
Physics
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