Ejs Open Source Double Slit Diffraction Model by lookang based on the works of Fu-Kwun Hwang found here

Ejs Open Source Single Slit Diffraction Model by Fu-Kwun Hwang remixed by lookang http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2314.0
Superposition of several waves http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2082.0 by Fu-Kwun Hwang
other good applets
JDK Double slit interference by Fu-Kwun Hwang http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=20.0

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