. Elements of applied microscopy. A text-book for beginners. Microscopy. 8 ELEMENTS OF APPLIED MICROSCOPY. deflected at all, because it will cut surfaces which are parallel to each other. Where these two rays meet the image of the point must be formed. Thus in Fig. 7 is shown a biconvex lens the surfaces of which have an equal curvature; its principal foci, therefore, lie at equal distances from its center. The object ah lies out- side the principal focus F. The image of the point a is. Fig. -Formation of Image by Object outside the Principal Focus. (After Hager-Mez.) determined by the str
. Elements of applied microscopy. A text-book for beginners. Microscopy. 8 ELEMENTS OF APPLIED MICROSCOPY. deflected at all, because it will cut surfaces which are parallel to each other. Where these two rays meet the image of the point must be formed. Thus in Fig. 7 is shown a biconvex lens the surfaces of which have an equal curvature; its principal foci, therefore, lie at equal distances from its center. The object ah lies out- side the principal focus F. The image of the point a is. Fig. -Formation of Image by Object outside the Principal Focus. (After Hager-Mez.) determined by the straight line aa^ and the broken line aca^. The image of the point h is similarly fixed, and between the two will be formed the enlarged image a'h'. This will be a real image—one, that is, which could be caught upon a screen held in the right plane,—and it will be inverted. These are the characteristics of all images formed by objects lying outside the principal focus. Fig. 8 illustrates the other case, in which the object lies inside the principal focus. Here it is evident that the rays from the point a will not meet at all on the opposite side of. the lens and therefore no real image can be. 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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