Q4. The intensity of transmitted light when a polaroid sheet is placed between two crossed polaroids at 22.5° from the polarization axis of one of the polaroids, is (I₀ is the initial intensity):
Explanation:
After first polaroid: I₁ = I₀ × cos²(22.5°)
After second (crossed) polaroid: I₂ = I₁ × cos²(67.5°)
⇒ I = I₀ × cos²(22.5°) × sin²(22.5°) = I₀ / 8
After first polaroid: I₁ = I₀ × cos²(22.5°)
After second (crossed) polaroid: I₂ = I₁ × cos²(67.5°)
⇒ I = I₀ × cos²(22.5°) × sin²(22.5°) = I₀ / 8
This MCQ from wave optics involves application of Malus’s Law and understanding of angular relations between polaroids. Practicing such problems improves accuracy and confidence in solving NEET Physics conceptual questions.
