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Sunlight reaching the earth is

  • A.unpolarised, being a random superposition of all polarisations
  • B.linearly polarised in the plane of the ecliptic
  • C.circularly polarised, with the sense set by the sun's rotation
  • D.elliptically polarised with an axial ratio near unity

Answer: A

Thermal emission from the sun's surface has no preferred direction, so all polarisations are present in random proportion. Scattering in the atmosphere partially polarises the light of the sky, which is why a polarising filter darkens it.

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