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A uniform plane wave is one in which the fields are

  • A.constant in magnitude and phase over any plane normal to the direction of travel
  • B.constant in magnitude everywhere in space at a given instant
  • C.confined to a single plane containing the direction of travel
  • D.polarised in a plane that rotates as the wave advances

Answer: A

The surfaces of constant phase are parallel planes, and over each of them the field is uniform. It is an idealisation, since a real source produces spherical waves, but far from the source a small region of a spherical wave is very nearly plane.

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