Here's a link to a wave tank simulator Java applet. It lets you program it in various ways and is a great way to get a feel for wave interactions.
http://www.falstad.com/ripple/
This is a list of wave tank videos that illustrate reflection, refraction, interference, diffraction, etc.
Reflection of a circular wave by a concave surface.
http://www.youtube.com/watch?v=-RBpOsgCdxo
Reflection of a straight wave by a concave surface.
http://www.youtube.com/watch?v=c1_k8RH8FoM
Circular wave reflected by a straight surface:
http://www.youtube.com/watch?v=Ymug2irciUs
Straight wave reflected by a straight surface:
http://www.youtube.com/watch?v=dGdXNglXMS4
Reflection of circular wave by a convex surface:
http://www.youtube.com/watch?v=y6hrqhdRnxk
Diffraction experiment:
http://www.youtube.com/watch?v=sjmBcm84iA4
Circular wave:
http://www.youtube.com/watch?v=SjllHXbmTCI
Interference Patterns
http://www.youtube.com/watch?v=o9J-uT1tVE0
Wave Refraction:
http://www.youtube.com/watch?v=8PQOlHs8Z7Q
Interference from Two Sources
http://www.youtube.com/watch?v=J_xd9hUZ2AY
Two Slit Interference:
http://www.youtube.com/watch?v=V-vWqji4BFs
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