Question: When yellow sodium light, = 589 nm, falls on a diffraction grating, its first-order peak on a screen 72.0 cm away falls 3.32 cm

When yellow sodium light, λ = 589 nm, falls on a diffraction grating, its first-order peak on a screen 72.0 cm away falls 3.32 cm from the central peak. Another source produces a line 3.71 cm from the central peak. What is its wavelength? How many slits / cm are on the grating?

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