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\begin{figure}\centerline{ \psfig{file=problems/prob_11_3.eps,height=2.5in} }\end{figure}

You have a candle and a lens with a focal length of 15 cm. You wish to cast a real image of the candle upon a screen. You want the image size (magnitude) to be exactly two times the size of the actual candle.

a) Find $s$ and $s'$ such that this kind of image can be formed.

b) Carefully place the components on the figure above and draw a ray diagram to locate the image, to scale, in agreement with your answers to a. Be sure to include the 3 rays that uniquely specify the image location.

Don't burn yourself on the candle.

Robert G. Brown 2003-02-09