Drag line at left until you think it is align with blue line at right side.
Then, click show check box to find out how good your guest is.

Click show2, then drag index n to see at what value it will meet with your prediction.
(the second line was calculated with snell's law n_1*\sin\theta_1=n_2 \sin\theta_2

translate strings in simulation to different language format before download
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Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
Download EJS jar file(983.2kB):double click downloaded file to run it. (2 times by 2 users) , Download EJS source View EJS source