A diffraction grating with produces first-order maxima for three narrow spectral…

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

A diffraction grating with 600 lines/mm600\,\text{lines/mm} produces first-order maxima for three narrow spectral lines at angles of 12∘12^{\circ}, 15∘15^{\circ}, and 18∘18^{\circ} to the central maximum. Assuming the lines lie within the visible spectrum, which ranking of their perceived colors from lowest to highest frequency is most consistent with these data? (a) Blue →\to Green →\to Red (b) Green →\to Red →\to Blue (c) Red →\to Green →\to Blue (d) Red →\to Blue →\to Green

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