This applet is [b]fiber optics[/b]
Created by prof Hwang Modified by Ahmed
Original project [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=200.0]fiber optics[/url]

You can drag the light source to different place or change the index of refraction for the material.
If the index of refraction is larger than 1.414 (square root of 2) ,
All the light enter the fiber will be totally reflected at the boundary.

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