Introduction: Optics Experiments on the Cheap
This video shows a simple way to test your optics for solar reflectors before you make them. I tried (and failed) to find software to do this.
Perhaps it is a good thing that I failed!
You can find info about compound parabolics at
and perhaps you could test out some of the designs they show with this simple technique!
We have a be nice policy.
Please be positive and constructive.