A helium-neon laser ( = 633 nm) illuminates a single slit and is observed on a screen

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A helium-neon laser (λ = 633 nm) illuminates a single slit and is observed on a screen 1.5 m behind the slit. The distance between the first and second minima in the diffraction pattern is 4.75 mm. What is the width (in mm) of the slit?

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