Question a diffraction grating has 3107 linescm light that, Ask an Expert

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Question: A diffraction grating has 3107 lines/cm. Light that contains all wavelengths between 420 and 656 nm shines on the grating.

Part A: Calculate the width of the dark area between the first and second order spectra on a screen 4.5 m away.

I need help to find the width of the dark area between the first and second order spectra on a screen 4.5 m away.

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