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Problem: Visible light passes through a diffraction grating that has 900 slits per centimeter, and the interference pattern is observed on a screen that is 2.64m from the grating. In the first-order spectrum, maxima for two different wavelengths are separated on the screen by 2.66mm.

Part A: What is the difference between these wavelengths?

Please break down every step and do not skip over anything - I have been at this problem awhile and keep getting hung up. Thanks for the help!

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