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Light emitted by element X passes through a diffraction grating that has 1200 slits/mm/mm. The interference...

Light emitted by element X passes through a diffraction grating that has 1200 slits/mm/mm. The interference pattern is observed on a screen 80.0 cmcm behind the grating. First-order maxima are observed at distances of 58.5 cmcm , 65.4 cmcm , and 90.6 cmcm from the central maximum.

What are the wavelengths of light emitted by element X?

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