A grating has 350 rulings/mm. What is the longest wavelength for which there is a 6.0th-order diffraction line

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# A grating has 350 rulings/mm. What is the longest wavelength for which there is a 6.0th-order diffraction line

A grating has 350 rulings/mm. What is the longest wavelength for which there is a 6.0th-order diffraction line