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A diffraction grating has 1 350 rulings/cm. On a screen 2.50 m from the grating, it...

A diffraction grating has 1 350 rulings/cm. On a screen 2.50 m from the grating, it is found that for a particular order m, the maxima corresponding to two closely spaced wavelengths of sodium (589.0 nm and 589.6 nm) are separated by 0.66 mm. Determine the value of m.

*I am extremely confused about this problem, please show all work and clearly explain how you got the answer*

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