http://demonstrations.wolfram.com/DesigningOpticalSystems/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This demonstrates an interactive lens system. Move any blue dot to control the location, thickness, and curvature of the lenses, or the starting point or angle of the rays. When you see rays shooting off at odd angles, you are seeing an accurate depicti...
Contributed by: Donald Barnhart, developer of Rayica and LensLab
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