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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)`.

Text Solution

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The differences between polarised and unpolarised light are :
1. Polarised light has electric fields oscillating in one direction, whereas, unpolarised light has electric fields oscillating in all directions.
2. Polarised light is coherent in nature whereas unpolarised light is incoherent in nature. 
3. Intensity of polarised light depends on the nature of polaroid used whereas, intensity of unpolarised light depends on the nature of source.
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