Lenses and Mirrors
Virtual Labs
VIDEOS
Ray Tracing Converging Lenses - Video
*note - I trust the videos on YouTube made by "gbsphysics" (who, incidentally, is Ms. Berlin at Glenbrook South); I've met her and she knows what she is doing.
Reflection by Curved Mirrors - Derek Owens - YouTube
Parabolic Reflectors - Derek Owens - You Tube
Ray Diagrams - Concave Mirrors
Ray Diagram - Concave Mirror - virtual image
Correcting Vision Videos (Michel van Biezen - YouTube)
Introduction to Farsightedness and Nearsightedness