A-LevelPhysicsWavesMay/June 2022Paper 1 Q261 Mark
Two polarising filters are placed next to each other so that their planes are parallel. The first polarising filter has its transmission axis at an angle of 50° to the vertical. The second polarising filter has its transmission axis at an angle of 20° to the vertical. The angle between the transmission axes of the two polarising filters is 30°. A beam of vertically polarised light of intensity 8.0 W m⁻² is incident normally on the first polarising filter. What is the intensity of the light that is transmitted from the second polarising filter?
Azero
B2.5 W m⁻²
C2.9 W m⁻²
D6.0 W m⁻²
✓ Correct Answer
The correct answer is B: 2.5 W m⁻²
📋 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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