Question: A diffraction grating has 2500 lines/cm. What is the angle between the first-order maximum for red light ( = 680 nm) and the first-order maximum

A diffraction grating has 2500 lines/cm. What is the angle between the first-order maximum for red light (λ = 680 nm) and the first-order maximum for blue light (λ = 410 nm)?

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