Ejs Open Source Refraction Wave Model across 2 straight media java applet
author fu-kwun hwang, remixed by lookang
from here http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=152.0

for learning objectives
State that waves can change direction as they cross straight boundaries between media and that this is called refraction
Explain that refraction is caused by a change of speed in the media and use rules to predict which way the ray bends when density changes

there is another good simulation here


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