Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 378
neanother direcHy as their respective distances from the optical center. § 301. To construct the image formed by a convex lens.— Given the lens L (Fig. 269), whose principal focus is at F (or F, Vtrtual images. 355 for rays coming from the other direction), and object AB in front ofit; any two of… … the latter will be deviated so as to pass through the principal focus F,and will afterward intersect the principal axis at some point a; so thisis the conjugate focus of A; similarly for B, and all intermediatepoints along the arrow. Thus, a real, inverted image is formed at ab. Fig. 270.
Physics
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