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(a) Distinguish between unpolarized lig...

(a) Distinguish between unpolarized light and linearly polarized light. How does one get linearly polarised light with the help of a plaroid ?
(b) A narrow beam of unpolarised light of intensity `I_(0)` is incident on a polaroid `P_(1)`. The light transmitted by it is then incident on a second polaroid `P_(2)` with its pass axis making angle of `60^(@)` relative to the pass axis of `P_(1)`. Find the intensity of the light transmitted by `P_(2)`.

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