Lenses -- links to Web tutorials

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Plane mirror images, video tutorials:

• A nice one, explaining how high a mirror should be so that you may see the image of your body,
  from the top of your head down to the tips of your toes.
• Another one, not bad.
• Yet another one.

Static and animated tutorials:

1. Plane mirror tutorial, K-12 level, but really worth reading!
2. Concave mirrors, ray tracing tutorial.
3. A good mirror tutorial (convex and concave);
4. A mirror tutorial, animated -- fun to watch it.
5. A Wikipedia article, general properties of lenses
6. Good ray tracing tutorial, showing step-by-step how it should be done
7. A Java-based "Virtual Lab", with a whole bunch of topics
8. Direct link to the "Virtual Lab" Java applet showing ray tracing for many different situations (lenses & mirrors);
9. A lens tutorial, not as good as 2 and 4, perhaps, but worth seeing, too;