Question: How wide does a single slit have to be so that (684-mathrm{nm}) light passing through the slit has its first dark fringe (20.0^{circ}) from the

How wide does a single slit have to be so that $684-\mathrm{nm}$ light passing through the slit has its first dark fringe $20.0^{\circ}$ from the center of the interference pattern?

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