Setup A uses light of wavelength and slits separated by

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

Problem

Setup A uses light of wavelength 500 nm500\,\text{nm} and slits separated by 0.25 mm0.25\,\text{mm}. For the same screen distance, the third bright fringe produced by setup A appears at exactly the same location as the fourth bright fringe produced by setup B, which uses light of wavelength 650 nm650\,\text{nm}. What is the slit separation in setup B? (a) 0.24 mm0.24\,\text{mm} (b) 0.49 mm0.49\,\text{mm} (c) 0.43 mm0.43\,\text{mm} (d) 0.33 mm0.33\,\text{mm}

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