A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 219
, then, is the virtual imageof A. By a similar process B is found to be the virtual imageof B. Pt the image of the point P, is here represented as lyingin the straight line between Af and Bf. It is usually sorepresented in books. Exercise 29 shows that it does notlie there. The image AB is… … FIG. 140. look if held at a comfortable seeing-distance from the eye.Hence the name magnifying-glass, so commonly given toa lens used as in Fig. 140. 169. Application of Formula.—The formula used in§ 163 to express the relation between focal length, object-distance, and image-distance, in the case…
Physics
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