. Elements of applied microscopy. A text-book for beginners. Microscopy. 6 ELEMENTS OF yiPPLIED MICROSCOPY. A biconvex lens works roughly, as if it were made up of an infinite number of prisms arranged about a central axis. Rays parallel to the principal axis of such a lens (the Hne joining the centers of curvature of its two surfaces,—will be bent from all directions toward that axis, and the rays nearest the outer edge or periphery will be most bent, so that all will meet at one point, known as the Principal Focus or burning-point of the lens (o, Fig. 5). The greater the curvature of the >
. Elements of applied microscopy. A text-book for beginners. Microscopy. 6 ELEMENTS OF yiPPLIED MICROSCOPY. A biconvex lens works roughly, as if it were made up of an infinite number of prisms arranged about a central axis. Rays parallel to the principal axis of such a lens (the Hne joining the centers of curvature of its two surfaces,—will be bent from all directions toward that axis, and the rays nearest the outer edge or periphery will be most bent, so that all will meet at one point, known as the Principal Focus or burning-point of the lens (o, Fig. 5). The greater the curvature of the >. Fig. s-—Plano-convex Lens and its Principal Focus. (After Hager-Mez.) lens the nearer to its optical center this principal focus will lie. 5. Formation of Images by the Convex Lens.—As the principal focus of a biconvex lens is defined as the point at which rays parallel to the principal axis meet, it is obvious that rays proceeding from a radiant point placed at the principal focus will be sent off on the other side of the lens as parallel rays, and will meet to form an image only at an infinite distance {B, Fig. 6). Rays from a point between the lens and its principal focus, i being still more divergent, will not even be made parallelj but will still continue to diverge after passing through. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Winslow, C. -E. A. (Charles-Edward Amory), 1877-1957. New York, J. Wiley; London, Chapman & Hall
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