[img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=2071.0;attach=3974;image[/img]

Check out similarity between interference of two point source and two sets of rings.

You can drag yellow dots to change center for those two sets of rings.

translate strings in simulation to different language format before download
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Download EJS jar file(959.9kB):double click downloaded file to run it. (27 times by 15 users) , Download EJS source View EJS source