Linear Waves
Circular wave. Wave packet diffraction on a slit new Resonances in square, circular membranes and a nonintegrable stadium. CPU based wave equation simulations are surprisingly fast on my 2.4GHz Core2
Interference fringes
Two point lights interference fringes and three point lights interference.
Reflection
Quantum reflection (interference) of a 2D wave packet (here |Ψ| is plotted).