NTNUJAVA Virtual Physics Laboratory
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To live close to great minds is the best kind of education. ..."John Buchan (1875~1940 Scotticsh historian, Governor General of Canada)"
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Author Topic: Fermat Principle  (Read 78913 times)
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Fu-Kwun Hwang
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on: January 29, 2004, 10:16:49 pm » posted from:,,Satellite Provider

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Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
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There are 5 translations,
Higher number at the end means more translation been done.
or


The path of a ray of light between two points is the path that minimizes the travel time.
This java applet let you visualize the above statement.
There are two region with different color (one for air and one for water).
The white dot is the light source.

 The program show all possible paths for light emitted from the point source, reach the air/water interface then all heading towards blue/green dot.
The real path which arrive at either blue or green dot, is the path that has the smallest traveling time. (shown as white paths




Usage:

  1. Left-click mouse for more information.(Ratio of numbers (red) related to refractive index!)
  2. Left-click and drag red, green or blue dots to move points.
  3. Left-click on air/water label to switch medium.
  4. Left-click on possible/real label (top left corner) to toggle.
  5. Right-click mouse to start/pause animation.



Right click the top left corner will show all the real paths for light emitted from point source.
(Click it again to toggle between possible paths and real paths Fig.B


Registed user can get files related to this applet for offline access.
Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
If java program did not show up, please download and install latest Java RUN TIME
There are 5 translations,
Higher number at the end means more translation been done.
or
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To live close to great minds is the best kind of education. ..."John Buchan (1875~1940 Scotticsh historian, Governor General of Canada)"
 
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