The figure shows four pairs of polarizing sheets, seen face-on. Each pair is mounted in the path of initially unpolarized light. The polarizing direction of each sheet (indicated by the dashed line) is referenced to either a horizontal x -axis or a vertical y axis. Rank the pair according to the fraction of the initial intensity that they pass, greatest first
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Final intensity of light is given by Brewster's law 
where θ θ = Angle between transmission axes of polariser and analyser.
(i) (ii) (iii) (iv)
Hence decreasing order of intensity is (i) > (iv) > (ii) > (iii)
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