Question: The width of a rectangular slit is measured in the laboratory by means of its diffraction pattern at a distance of 2m from the slit.

The width of a rectangular slit is measured in the laboratory by means of its diffraction pattern at a distance of 2m from the slit. When illuminated normally with a parallel beam of laser light (623.8nm), the distance between the third minima on either side of the principal maximum is measured; an average of several measurements gives 5.625cm. What is the width of the slit?

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