polarization by scattering

The phenomenon in which unpolarized light get polarized when scatter from a atom is called polarization by scattering

When a unpolarized light having frequency w strike a atom on surface . The atom absorb electromagnetic radiation and start vibrating with same frequency w . And resulting radiation of electromagnetic waves . Those atom or charged particles may not free of constraints . I.e they not free to vibrate in any direction result absorbing some E vector components (or B) 
Results polarized of partially polarized light. Example is our sky  And also it depends upon in which angle you look at image Below a image to demonstrate


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