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A wave incident on a boundary where the second medium has the higher impedance is reflected with

  • A.no reflection at all, whatever the impedance ratio
  • B.no phase reversal of the electric field
  • C.the electric field reversed in phase
  • D.the electric field rotated through ninety degrees

Answer: B

The reflection coefficient is positive when the second impedance is the larger, so the reflected electric field keeps its sign. Going the other way, toward a lower impedance, reverses it, and a conductor is the extreme case of that.

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