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Old May 2nd 2009, 05:52 PM   #1
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π phase shift in reflection/refraction/transmission?

when doing reflecton/refraction/transmission of wave light exercise,we must take phase shift into account. but in what situation there is a π phase shift ?

or other phase shift? i cannot apply it well!!!
help~
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Old May 2nd 2009, 08:16 PM   #2
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As far as I know There is a phase change of pi (180 degree) when a Wave is reflected by an optically denser medium. No phase change occurs while reflection from a rarer medium or during refraction.

Consider a wave falling on a transparent glass plate. Some part of it is reflected by upper(front) surface and some part is reflected by the lower surface( the rest is absorbed and transmitted). In this case the first reflected wave( reflected by a denser medium ) would suffer a phase change of pi. No phase change will be seen in the wave reflected by lower surface as this the reflection by rarer medium ( say air )
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