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Three polarizing disks whose planes are parallel and centred on common axis. The directions of their...

Three polarizing disks whose planes are parallel and centred on common axis. The directions of their transmission axes relative to the vertical are respectively: θ1 = 15o, θ2 = 38o, and θ3 = 61o. A beam of light polarized along the vertical is incident onto the first polarizer with an intensity of I0 = 10 W/m². Calculate the transmitted intensity through all three polarizers. The answer is 6.7, but I am unable to get that.

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