Is Light Wave Always Linearly Polarized?

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curious bishal
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Is light wave always linearly polarized?
 
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No. It depends on the source, and if it passes through a polariser, or if it is reflected off some medium that causes polarisation.
 
You can also have un-polarized, circularly polarized light, elliptically polarized light, partially linearly polarized light, partially ... You get the gist.