A-LevelPhysicsSuperposition9702/12 · Feb/Mar 2025 · Q291 Mark

Light of wavelength 567 nm is incident normally on a diffraction grating. The grating has 400 lines per mm. A number of diffraction maxima are observed on the far side of the grating. What is the angle between the second-order maximum and the third-order maximum?

A13.1°

B13.9°

C15.9°

D27.0°

✓ Correct answer

C: 15.9°

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2025 Paper 1 Variant 2, question 29.

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