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A diffraction grating illuminated by red (630-nm) light creates the fringe pattern shown below on ...
A diffraction grating illuminated by red (630-nm) light creates the fringe pattern shown below on a screen fixed \( 1.8 \mathrm{~m} \) away from the grating. Determine the slit density of the grating in lines \( / \mathrm{mm} \). Do not use the small-angle approximation for this question.