Question: Visible light passes through a diffraction grating that has 9 0 0 slits / cmslits / cm and the interference pattern is observed on a

Visible light passes through a diffraction grating that has 900 slits/cmslits/cm and the interference pattern is observed on a screen that is 2.72 mm from the grating.
Is the angular position of the first-order spectrum small enough for sinsin to be a good approximation?

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