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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