NEET PhysicsClass 12Malus' law and crossed polaroidsHardSingle correct

Unpolarised light of intensity I₀ passes through two crossed polaroids P₁ and P₃. A third polaroid P₂ is inserted between them with its pass axis at 30° to that of P₁. What intensity now emerges from P₃?

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Unpolarised light of intensity I₀ passes through two crossed polaroids P₁ and P₃. A third polaroid P₂ is inserted between them with its pass axis at 30° to that of P₁. What intensity now emerges from P₃?

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