A-LevelPhysicsSuperposition9702/12 · May/June 2019 · Q291 Mark

Monochromatic light is directed at a diffraction grating, as shown. [Figure 29.1] Which diagram could show all the possible directions of the light, after passing through the grating, that give maximum intensity?

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A[Diagram A showing three diffracted beams, one central and two at equal angles on either side]

B[Diagram B showing multiple diffracted beams at increasing angles, with a wider angular spread]

C[Diagram C showing five diffracted beams, one central and two pairs at distinct equal angles on either side]

D[Diagram D showing only one beam continuing straight through]

✓ Correct answer

C: [Diagram C showing five diffracted beams, one central and two pairs at distinct equal angles on either side]

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2019 Paper 1 Variant 2, question 29.

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