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An elliptically polarised wave becomes linearly polarised when the phase difference between its two components is

  • A.zero or one hundred and eighty degrees
  • B.ninety degrees
  • C.forty-five degrees
  • D.any value

Answer: A

With the two components in step, or exactly out of step, the resultant stays along a fixed line whose slope is set by the amplitude ratio. Ninety degrees with equal amplitudes gives the circular case, and everything else gives an ellipse.

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