A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2025 · Q291 Mark

The equation nλ = dsin θ can be used with a diffraction grating to find the wavelength of visible light. Which quantity is not correct for use in this equation?

Adistance from grating to screen

Bwavelength of light

Corder of intensity maximum

Ddiffraction angle of intensity maximum

✓ Correct answer

A: distance from grating to screen

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

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