[Tutor] Simple physics simulations)

[Jim Morcombe]

I want to write a program that helps teach students how to draw ray 
diagrams for lenses and mirrors. 
Vpython seems to be used for a number of physics simulations, but may be 
overkill for my application.  Although there are a few 3D things I would 
like to do, most just involves drawing curves and simple objects, and 
allowing the User to do the same.

So the question - What is the best thing to use to draw and manipulate 
simple 2D objects in an application like this?

Jim Morcombe