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THE WONDERS OF OPTICS.
a concave mirror, and the particular point at which we suppose we see our reflection is called the virtual focus.
Fig. 20.—Virtual Focus.
If instead of a candle we place our head before a concave mirror, we shall see ourselves magnified as in fig. 21.
Fig. 21.—Concave Mirror.
We shall easily see how this happens by tracing the paths of the rays in fig. 22.
