Question: Suppose that a grating spectrometer while in vacuum on Earth sends 500-nm light off at an angle of 20.0 in the first-order spectrum. By comparison,

Suppose that a grating spectrometer while in vacuum on Earth sends 500-nm light off at an angle of 20.0° in the first-order spectrum. By comparison, after landing on the planet Mongo, the same light is diffracted through 18.0°. Determine the index of refraction of the Mongoian atmosphere.

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