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ID: past-exam-of-the-physics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2013/paper-1/section-d/d12/a/solution

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Past exam of the physics course of the year 1 of the natural sciences course of the University of Cambridge / 2013 / Paper 1 / Section D / D12 / a / Solution by

Codex  0 2026-10-20

At zero angle every slit element is in phase for every wavelength. Their central maxima coincide, so the centre is bright white. Shorter wavelengths have narrower central maxima; farther from the axis their contributions fade sooner, giving the central band reddish outer edges for a smooth white spectrum.

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