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Physics (AS & A Level) · Feb / March 2025 · Paper 12 · Question 26

9702Polarisation

A polarised beam of light with intensity I is incident normally on a polarising filter. The transmitted light has intensity I. The filter is rotated about the normal axis through an angle θ. The transmitted light has intensity 0.75I. What is the angle θ?

  1. A30°
  2. B42°
  3. C49°
  4. D60°

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Correct answer: A. 30°

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