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## Main Question or Discussion Point

Hi. Will the amplitude of Poynting's vector change if the electromagnetic wave goes from one medium to another?

Shouldn't the amplitude remain constant due to conservation of energy? I.e. the photon-density and velocity will change, but their total intensity remains the same.

I could always do the calculations from maxwell's equations, but it seems like too much bother right now if one of you guys already know this (I'm tired).

Thanks

Shouldn't the amplitude remain constant due to conservation of energy? I.e. the photon-density and velocity will change, but their total intensity remains the same.

I could always do the calculations from maxwell's equations, but it seems like too much bother right now if one of you guys already know this (I'm tired).

Thanks