TE polarized plane wave propagating in air is incident at 45o onto a perfect electric conductor (PEC). The position of the first minima of the electric field from the PEC occurs at 21.213 cm away from the surface. Find the frequency of the wave. 
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As a matter of first importance, an impeccable electric channel can bolster no electric field inside.
This implies the wave can't keep proliferating into the conductor.
Presently, there is vitality stream in the occurrence wave. This vitality can't simply vanish in the wake of falling at the interface;
it needs to go some place. This is the thing that profits the other way as the reflected wave.
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