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\begin{figure}\centerline{ \psfig{file=problems/prob_12_11.eps,height=2.5in} }\end{figure}

There is an object 20 cm away from a screen. Using a concave mirror, I would like to throw an image of this object upon the screen that is three times larger than the object itself. Find the location of the mirror (with respect to object and screen and the focal length of the mirror necessary to accomplish this. Draw the corresponding ray diagram.

Robert G. Brown 2003-02-09