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Author Topic: refraction of wave from one media to another media  (Read 2846 times)
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on: June 08, 2010, 05:54:34 pm » posted from:SAO PAULO,SAO PAULO,BRAZIL

This following applet is refraction of wave from one media to another media
Created by prof Hwang Modified by Ahmed
Original project refraction of wave from one media to another media

When a beam of light impings at some angle on the smooth flat surface of an optically dense medium, the wave "sees" a vast array of very closely spaced atoms that will somehow scatter it.
(At the wavelengths of light -- d=500nm -- the Earch's atmosphere at STP has about 106 molecules in such a d3-cube).
As the wavefront descends, it excites one scatterer after another, each of which reradiates a stream of photons that can be thought of as a hemispherical wavelet in the incident medium.
Because the wavelength is so much greater than the separation between the molecules, the wavelets advance together and add constructively in only one directions, and there is one well-defined reflected beam.
The wavelets bend as they cross the boundary, because of the speed change.
For similar reason, they form one well-defined refracted beam.

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* refraction of wave from one media to another media.gif (23.72 KB, 776x548 - viewed 219 times.)
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