Problem a diffraction grating has 3996 linescm light that, Ask an Expert

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Problem: A diffraction grating has 3996 lines/cm. Light that contains all wavelengths between 464 and 638 nm shines on the grating.

Part A: Calculate the width of the dark area between the first and second order spectra on a screen 3.9 m away.

I want help to find the width of the dark area between the first and second order spectra.

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