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Following the technique described in section 22.6, this simulation shows the
location of images formed by converging and diverging lenses. The location of
the image formed depends on the object distance, the type of lens, and the focal
length of the lens. As in figure 22.18, three lines are drawn from a point on
the object (which is treated as if it were a planar object). The white lines
in the simulation correspond to the broken black lines in the book's illustration.
The white squares represent the focal points of the lenses. See also figures
22.19 and 22.20.
