Visible light passes through a diffraction grating that has, Ask an Expert

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Visible light passes through a diffraction grating that has 900 slits per centimeter, and the interference pattern is observed on a screen that is 2.22 m from the grating.

In the first-order spectrum, maxima for two different wavelengths are separated on the screen by 3.22 mm. What is the difference between these wavelengths? Express your answer in meters.

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