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The light from a clear blue portion of t...

The light from a clear blue portion of the sky shows a rise and fall of intensity when viewed through a polaroid which is rotated. Describe, with the help of a suitable diagram, the basic phenomenom/process which occurs to explain this observation.

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The light coming from a portion of the sky is sunlight that has changed its direction due to scattering by molecules in the earth's atmosphere. This scattered light is polarised. Therefore, it shows a variation in intensity when viewed through a polaroid on rotation.
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