The spectrum of sodium has two closely spaced lines, known as the sodium doublet, with wavelengths 589.0 nm and 589.6 nm. When sodium light is incident on a diffraction grating with 2,950 rulings/cm, the maxima corresponding to this doublet are separated by Ay = 1.28 mm when the screen is L = 1.50 m from the grating. What is the value of m in this situation? m = Need Help? Read It Submit