A-LevelPhysicsWavesMay/June 2023Paper 1 Q241 Mark
A vertically polarised beam of light of intensity I₀ is incident normally on a polarising filter. The transmission axis of the filter is at 45° to the vertical. The beam of light transmitted by this filter is then incident normally on a second filter. The transmission axis of the second filter is horizontal. [Figure 24.1] What is the intensity of the beam of light after transmission through the second filter?
A0
B¼ I₀
C½ I₀
DI₀
✓ Correct Answer
The correct answer is B: ¼ I₀
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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