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(a) Using the phenomenon of polarization, show how transverse nature of light can be demonstrated.

(b) Two Polaroid P1 and P2 are placed with their pass axes perpendicular to each other. Unpolarised light of intensity Io is incident on P1. A third Polaroid P3 is kept in between P1 and P2 such that its pass axis makes an angle of 30o with that of P1. Determine the intensity of light transmitted through P1, P2 and P3. 

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