You can change the focus of the mirror and find out how the image changed when tiger is moving.

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translate strings in simulation to different language format before download
Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
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(1956.5kB):double click downloaded file to run it. (12 times by 8 users) , Download EJS source (4 times by 3 users) View EJS source