Angle Between Polarizers

Two polarisers P₁ and P₂ are placed in such a way that the intensity of the transmitted light will be zero. A third polariser P₃ is inserted in between P₁ and P₂, at the particular angle between P₂ and P₃. The transmitted intensity of the light passing through all the three polarisers is maximum. The angle between the polarisers P₂ and P₃ is :

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