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.
Part A: In the first-order spectrum, maxima for two different wavelengths are separated on the screen by 2.66 mm.
Part B: What is the difference between these wavelengths?
Please explain how you came to your conclusion.