**Allows Creativity of Solution Method**

Because of the plethora of given information and the dynamic nature of Physlet problems, multiple solution methods are often available. For example, the above problem could be solved correctly by...

-Looking to see where an incoming parallel ray crosses the principle axis.

-Placing the source where all rays leave the mirror parallel.

-Considering the source an object, measuring object and image distances, and using the lens equation.

-Finding R by finding the point where the rays converge on the source. f=R/2.