Question: A source produces first-order lines when incident normally on a 9800-slit/cm diffraction grating at angles 28.8, 36.7, 38.6, and 41.2. What are the wave lengths?

A source produces first-order lines when incident normally on a 9800-slit/cm diffraction grating at angles 28.8°, 36.7°, 38.6°, and 41.2°. What are the wave lengths?

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