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Circular polarisation results from combining two linearly polarised waves that are

  • A.parallel, equal in amplitude and in phase with one another
  • B.perpendicular, of unequal amplitude and in phase
  • C.perpendicular, equal in amplitude and in phase
  • D.perpendicular, equal in amplitude and ninety degrees apart in phase

Answer: D

The resultant vector then has constant magnitude and rotates uniformly, tracing a circle in the wavefront plane. Unequal amplitudes or a phase difference other than ninety degrees give an ellipse, and zero phase difference gives a line.

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