A helium-neon laser ( λ=633nm) illuminates a single slit and is observed on a screen 1.50m 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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  1. aren't there standard equations for this?

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  2. 43

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  3. 112

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