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EM-wave hits a brick-wall, $\pi/2$ -phase-shift? [duplicate]

Possible Duplicate: Phase shift of 180 degrees on reflection from optically denser medium If I have a cord-wave, I get a phase-shift with attached cord but do I get such a phase-shift with ...
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Phase shift of 180 degrees on reflection from optically denser medium

Can anyone please provide an intuitive explanation of why phase shift of 180 degrees occurs in the Electric Field of a EM wave,when reflected from an optically denser medium? I tried searching for it ...