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Thanks to all those who responded, both on-list and off-list. -- For 
anyone interested in this subject, there's a very intuitive, reasonably 
powerful open-source Java program available called OpticalRayTracer: 
http://arachnoid.com/OpticalRayTracer/

It doesn't simulate mirrors--only lenses--but it has some nice 
features.  For instance, under "help", they describe a Dispersion 
Experiment that sets up a simulation of an achromat lens--VERY cool.  
Looks as if the program could be a good resource for teaching.

Martin

On Mon, Jul 28, 2014 at 6:31 PM, Martin Wessendorf wrote:
> Can anyone recommend a simple freeware program that generates ray diagrams
> for lenses and mirrors?  Something more flexible than the simulators on
> Microscopy U and places like that?
>
> Thanks!
>
> Martin Wessendorf

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