A-LevelPhysicsSuperposition9702/12 · May/June 2020 · Q301 Mark
Light of wavelength λ is incident normally on a diffraction grating. The angle between the second-order maximum and the normal to the grating is θ. The variation with sin θ of λ is shown on the graph. [Figure 30.1] How many lines per millimetre are on the diffraction grating?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A400 mm⁻¹
B625 mm⁻¹
C800 mm⁻¹
D1250 mm⁻¹
✓ Correct answer
A: 400 mm⁻¹
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