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Calculate the angular dispersion (delta theta) between light rays with wavelengths of 512.23 and 512.26 nm...

Calculate the angular dispersion (delta theta) between light rays with wavelengths of 512.23 and 512.26 nm for first-order diffraction (n=1) and thirtieth-order diffraction (n=13) from a grating with 250 lines/mm and theta=3 degrees

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