Unpolarized light of intensity 32Wm –2 passes through three polarizers such that transmission axes of the first and second polarizer makes and angle 30° with each other and the transmission axis of the last polarizer is crossed with that of the first. The intensity of final emerging light will be
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Angle between P 1 and P 2 = 30° (given)
Angle between P 2 and P 3 = θ θ = 90° – 30° = 60°
The intensity of light transmitted by P 1 is 
According to Malus law the intensity of light transmitted by P 2 is 
Similarly intensity of light transmitted by P 3 is 
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