Ray-optics: a web app to simulate the reflection and refraction of light
There was a fun game for the Zune HD reminiscent of this called Dr. Optics Light Lab. The only record of it seems to be these poor-quality YouTube videos:
https://www.youtube.com/watch?v=xKvLCDMe2Og https://www.youtube.com/watch?v=zeUYFhT68E4