In a double-slit experiment using light of wavelength 600 nm

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

Problem

In a double-slit experiment using light of wavelength 600 nm, the screen is 2.0 m from the slits. Bright fringes are observed to be 4.5 mm apart, and the first diffraction minimum (caused by the finite slit width) occurs 18 mm from the central maximum. Which pair of slit parameters is most consistent with these observations? (a) d=0.14 mm,  a=0.07 mmd = 0.14\,\text{mm},\; a = 0.07\,\text{mm} (b) d=0.28 mm,  a=0.14 mmd = 0.28\,\text{mm},\; a = 0.14\,\text{mm} (c) d=0.28 mm,  a=0.07 mmd = 0.28\,\text{mm},\; a = 0.07\,\text{mm} (d) d=0.40 mm,  a=0.10 mmd = 0.40\,\text{mm},\; a = 0.10\,\text{mm}

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