Can anyone explain the purpose of measuring light polarisation, as carried out by the upcoming planck satellite?
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Polarized light carries information about the geometrical and optical properties of the source or medium Many a times in observational astronomy, we need information on the interstellar/intergalactic medium and its scattering properties. That is observed by how it affects the polarization of light from a source behind it. That was one example. Here's a link: http://physics.bu.edu/py106/notes/Polarization.html The above link explains some reasons which might cause polarization of light. And these are employed to study the properties of source and medium. On a personal note, though, there are no limitations. There might be other reasons which polarize light, yet to be undiscovered. It's a delicate property. |
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