. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 3o8 PHYSIOLOGICAL PHYSICS. [Chap. xxiv. To summarise, a concave mirror will give a mag- nified view of an object, so long as the object is nearer to the mirror than the centre of curvature ; when the object is outside of the principal focus, the image is inverted, when within the principal focus it is erect. 2. Convex mirrors. — We have seen that in con- vex mirrors the foci are virtual ; hence, images will also be virtual. Let MN be
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 3o8 PHYSIOLOGICAL PHYSICS. [Chap. xxiv. To summarise, a concave mirror will give a mag- nified view of an object, so long as the object is nearer to the mirror than the centre of curvature ; when the object is outside of the principal focus, the image is inverted, when within the principal focus it is erect. 2. Convex mirrors. — We have seen that in con- vex mirrors the foci are virtual ; hence, images will also be virtual. Let MN be a convex mirror (Fig. 134),a%e'its principal axis, and ab an arrow in front of it. Incident rays from ab Fig. 134.—Virtual Image of Convex Mirror. are reflected in diver- gent directions, i' G H and i, their backward prolongations meet at A and B. Here a virtual image is formed, erect, but smaller than the object. Convex mirrors, then, diminish the apparent size of objects. The size of the image may be calculated from various data. Thus, the size of the image may be calculated from the size of the object, if, besides, the distance of each from the centre of curvature be known. The formula stands thus : length of image length of object distance of image from centre distance of object from centre distance of image length of image = length of object X distance of object' In a similar way the size of the object may be calcu- lated, provided the size of the image be known, and their respective distances from the centre of cur- vature. REFRACTION OF LIGHT. A ray of light in passing obliquely out of one. 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 M'Gregor-Robertson, J. (Joseph), 1858-1925. Philadelphia, H. C. Lea's son & co.
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