Some help with Ray Diagrams for Physics

Hi folks,

These websites do a very nice job explaining ray diagrams and how to draw them. There are videos as well.

Convex Mirrors http://www.physicsclassroom.com/class/refln/Lesson-4/Ray-Diagrams-Convex-Mirrors

Concave Mirrors http://www.physicsclassroom.com/class/refln/Lesson-3/Ray-Diagrams-Concave-Mirrors

Convex Lenses http://www.physicsclassroom.com/class/refrn/Lesson-5/Converging-Lenses-Ray-Diagrams

Concave Lenses http://www.physicsclassroom.com/class/refrn/Lesson-5/Diverging-Lenses-Ray-Diagrams

Jim Mueller