A He–Ne laser (wavelength 632 nm) illuminates two closely spaced slits

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

Problem

A He–Ne laser (wavelength 632 nm) illuminates two closely spaced slits. The screen is only 0.20 m from the slits, and the first bright fringe appears 8.0 mm from the central maximum. Determine the slit separation. (a) 0.032 mm0.032\,\text{mm} (b) 0.0016 mm0.0016\,\text{mm} (c) 0.016 mm0.016\,\text{mm} (d) 0.008 mm0.008\,\text{mm}

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