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µoªí©ó¡G Feb 28 2004, 10:57 ¡@
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µoªí©ó¡G Feb 28 2004, 11:07 ¡@
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µoªí©ó¡G Feb 28 2004, 13:09 ¡@
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µoªí©ó¡G Feb 28 2004, 13:29 ¡@
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µoªí©ó¡G Feb 28 2004, 14:10 ¡@
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ª½±µ®M¥Î AL Physics Ãö©ówaveªºconcept :
for a certain wavelength of light, the reflected light will have a 90 degree phase change due to the larger refractive index of the plastic. The refracted light, on the other hand, does not have any phase change since it is travelling in plastic before returning back to the upper side of the air. then, considering the physical path difference: the refracted light would travel a distance of 2L more than the reflected light (L is the width of the plastic layer). So if width=(n+ 0.5)wavelength, then constructive interferences occur, if width=(n)wavelength, then constructive interferences occur. the alternative constructive and destructive interferences would then form equal-space lines in the screen. for the case of visual light, difference wavelength would have the same round of constructive interference at different position in the screen. However, because the differences are so small, our human eyes could only see a "rainbow" spectum. that's all for my presentation, thank you for your attention. |
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µoªí©ó¡G Nov 29 2004, 13:50 ¡@
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µoªí©ó¡G Nov 30 2004, 06:43 ¡@
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µoªí©ó¡G Nov 30 2004, 07:45 ¡@
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µoªí©ó¡G Dec 1 2004, 06:31 ¡@
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µoªí©ó¡G Dec 1 2004, 07:28 ¡@
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µoªí©ó¡G Dec 12 2004, 21:41 ¡@
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µoªí©ó¡G Dec 29 2004, 08:22 ¡@
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