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A diffraction grading with N = 15,000 lines/m creates an interference pattern on a screen 2.0m...

A diffraction grading with N = 15,000 lines/m creates an interference pattern on a screen 2.0m away. The distance between the central maximum and the 1st maximum is 0.02m. Calculate the wavelength of the light

the answer is 660 nm, just need to know how to get to answer.
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