Wave Links
 

Refraction demonstration : try altering the angle of incidence andmaking changes to the refractive index. [http://didaktik.physik.uni-wuerzburg.de/~pkrahmer/ntnujava/propagation/propagation.html]

 Interactive ray diagram for a convex lens : move the object with the mouse and see the ray diagram change. [http://didaktik.physik.uni-wuerzburg.de/~pkrahmer/ntnujava/indexPopup.html]

Synthesis of waves : make complex waves by mixing sine waves. [http://www.gac.edu/~huber/fourier/index.html]