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 2.70 meter from the grating.

In the first-order spectrum, maxima for two different wavelengths are separated on the screen by 3.10 millimeter. Compute the difference between these wavelengths?

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