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A diffraction grating has 6 * 10^5 lines/m. Find the angular spread in the second order spectrum between red light of wavelength 7 * 10^-7 m and blue light of wavelength 4.5 * 10^-7 m.

A diffraction grating has 6 * 10^5 lines/m. Find the angular spread in the second order spectrum between red light of wavelength 7 * 10^-7 m and blue light of wavelength 4.5 * 10^-7 m.

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