What is the width of a slit for which the first minimum is


Question: What is the width of a slit for which the first minimum is at 45o when the slit is illuminated by a helium-neon laser (wavelength=633nm)?

I need help to solve the given question and the small angle approximation is not valid at 45o.

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Physics: What is the width of a slit for which the first minimum is
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