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Simon Bridge
Feb10-13, 09:01 PM
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P: 12,475
where k, kr and kt are wave vectors of incident, reflected and transmitted wave.
... so what is ##\vec{r}## ?

I think you may have missed part of the proof out though... merely showing that three vectors have the same extent against a fourth vector does not show that they are all co-planar. All you have to do is rotate one of the first three about the fourth to see this.