A-LevelPhysicsSuperpositionMay/June 2021Paper 1 Q291 Mark
A parallel beam of light consists of light of wavelength 420 nm and light of wavelength 630 nm. The light is incident normally on a diffraction grating. The diffraction maxima for the two wavelengths overlap only at an angle of 31° from the direction of the incident light beam. What could be the line spacing of the diffraction grating?
A1.2 µm
B1.6 µm
C2.4 µm
D3.7 µm
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of superposition within the Physicssyllabus. The examiner's mark scheme requires...
📋 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...
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