A diffraction grating has 6.5 x 105 slits / m. Find the angular spread in the second-order

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A diffraction grating has 6.5 x 105 slits / m. Find the angular spread in the second-order spectrum between red light of wavelength 7.0 x 10-7 and blue light of wavelength 4.5 x 10-7 m.
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