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Why does a spectroscope need a diffraction grating.

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Answer: Well, because the diffraction grating allows optical spectroscopy and a grating disperses light of different wavelengths to give. Wavelengths like any wavelength, a narrow fringe.

User Steve McFarlin
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A grating disperses light of different wavelengths to give, for any wavelength, a narrow fringe. This allows precise spectroscopy. I hope that helps
User Mirageglobe
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