illusion AB>CD?

[Fu-Kwun Hwang]

We all think that AB>CD (distance between point A and B is much larger than distance between point C and D).
However, there are almost the same length!
Click play button to find out!

You can also use slider to adjust length (w) and angle (c).

Embed a running copy of this simulation
<applet code='users.ntnu.fkh.illusion_samelength_pkg.illusion_samelengthApplet.class' archive='http://www.phy.ntnu.edu.tw/ntnujava/ejsuser/2/ejs_illusion_samelength.jar' name='illusion_samelength7641' id='illusion_samelength7641' width='503' height='340' 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=7641' 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!