This page has been validated.
114
THE WONDERS OF OPTICS.
a concave mirror, and the particular point at which we suppose we see our reflection is called the virtual focus.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b1/The_wonders_of_optics_-_Fig_20.png/400px-The_wonders_of_optics_-_Fig_20.png)
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.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f3/The_wonders_of_optics_-_Fig_21.png/200px-The_wonders_of_optics_-_Fig_21.png)
Fig. 21.—Concave Mirror.
We shall easily see how this happens by tracing the paths of the rays in fig. 22.