A-LevelPhysicsSuperposition9702/12 · Feb/Mar 2020 · Q291 Mark

Light of wavelength λ is incident normally on a diffraction grating, as shown. [Figure showing light of wavelength λ incident on a diffraction grating, with the angle φ between the two second-order maxima indicated] The angle between the two second-order maxima is φ. Which expression gives the spacing of the lines on the diffraction grating?

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Aλ / sin φ

Bλ / sin (φ/2)

C2λ / sin φ

D2λ / sin (φ/2)

✓ Correct answer

D: 2λ / sin (φ/2)

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2020 Paper 1 Variant 2, question 29.

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