Benham's Disk:A rotating black-and-white disk produces the illusion of color.

[Fu-Kwun Hwang]

A rotating black-and-white disk produces the illusion of color.

When this black-and-white pattern rotates at the right speed, the pattern appears to contain colored rings. You see color because the different color receptors in your eyes respond at different rates.

You can use slider to change period T of the rotation and frame per second (fps) for the simulation.

Embed a running copy of this simulation
<applet code='users.ntnu.fkh.illusion_benhamdisk_pkg.illusion_benhamdiskApplet.class' archive='http://www.phy.ntnu.edu.tw/ntnujava/ejsuser/2/ejs_illusion_benhamdisk.jar' name='illusion_benhamdisk7734' id='illusion_benhamdisk7734' width='462' height='576' mayscript=true><param name='draggable' value='true'></applet>
Embed a running copy link(show simulation in a popuped window)
<a href='http://www.phy.ntnu.edu.tw/ntnujava/msg.php?smfejs=7734' target='smfejs'>Run simulation</a>

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

• Please feel free to post your ideas about how to use the simulation for better teaching and learning.
• Post questions to be asked to help students to think, to explore.
• Upload worksheets as attached files to share with more users.

Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!

http://www.youtube.com/watch?v=6LoeZ1CgVyQ&NR