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The dispersion of a diffraction grating such as the one shown at the right, is the angle of separation per m of wavelength? It depends on the order of the diffraction (n), the distance between grooves (d) as well as the angle of the emerging light (?). Compute the dispersion at 21° of the first order diffraction for a grating with 1.20 × 103 grooves per centimeter.

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