Inspired by a 2002 article in The Physics Teacher by Melissa Dancy, Wolfgang Christian, and
Mario Belloni.

The goal ultimately is to determine the focal length of a converging mirror. When you have
figured it out, set the slider to that value, and then check your answer. See how many ways you
can come up with to find the focal length.

Simulation first posted on 3-15-2018. Written by Andrew Duffy