What will happened if part of the light path were blocked

[Fu-Kwun Hwang]

There is a common mis-concept among students:
 Blocking part of the lens surface would block the corresponding part of the image.

The intensity of the image for the object is reduced is some light path were blocked (the whole image is still there).
Click "block part of light path" button or drag lower end of the black line to lower position to block part of light paths.
The intensity is not the same if part of the light paths were blocked.

You can change the slit position and its width with mouse drag and drop function.
-*-

Embed a running copy of this simulation
<applet code='users.ntnu.fkh.thinlensintensity_pkg.thinlensintensityApplet.class' archive='http://www.phy.ntnu.edu.tw/ntnujava/ejsuser/2/ejs_thinlensintensity.jar' name='thinlensintensity851' id='thinlensintensity851' width='684' height='355' 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=851' target='smfejs'>Run simulation</a>

Full screen applet or 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!

[lookang]

applet no loading please check [noeqn]

Java Plug-in 1.6.0_17
Using JRE version 1.6.0_17-b04 Java HotSpot(TM) Client VM


load: class users.ntnu.fkh.thinlensintensity_pkg.thinlensintensityApplet.class not found.
java.lang.ClassNotFoundException: users.ntnu.fkh.thinlensintensity_pkg.thinlensintensityApplet.class
   at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
   at java.lang.ClassLoader.loadClass(Unknown Source)
   at java.lang.ClassLoader.loadClass(Unknown Source)
   at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
   at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
   at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
   at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://www.phy.ntnu.edu.tw/ntnujava/ejs4/users/ntnu/fkh/thinlensintensity_pkg/thinlensintensityApplet/class.class
   at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
   at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
   at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
   at java.security.AccessController.doPrivileged(Native Method)
   ... 7 more

[Fu-Kwun Hwang]

Thank you! It is fixed now. (It is seems to be java version problem).