(a) Why does unpolarised light from a source show a variation in intensity when viewed through a polaroid which is rotated? Show with the help of a diagram, how unpolarised light from sun gets linearly polarised by scattering.

(b) Three identical polaroid sheets P1, P2 and P3 are oriented so that the pass axis of P2 and P3 are inclined at angles 60° and 90° respectively with the pass axis of P1.

A monochromatic source S of unpolarized light of intensity I0 is kept in front of the polaroid sheet P1 as shown in the figure.

Determine the intensities of light as observed by the observer at O, when Polaroid P3 is rotated with respect to P2 at angles θ=30° and 60°

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