A-LevelPhysicsWavesOct/Nov 2023Paper 1 Q241 Mark
A plane polarised light wave of intensity I₀ is incident normally on a polarising filter. The initial intensity of the transmitted wave is 0. A second polarising filter is then inserted between the source and the first filter. Its transmission axis is at 45° to the transmission axis of the first filter, as shown. [Figure 24.1] What is the intensity of the transmitted wave from the filter combination?
A0
BI₀/8
CI₀/4
DI₀/2
✓ Correct Answer
The correct answer is C: I₀/4
📋 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.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep