Using a diffraction grating with 100 slits (/ mathrm{mm}) to create a diffraction pattern on a screen

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Using a diffraction grating with 100 slits \(/ \mathrm{mm}\) to create a diffraction pattern on a screen \(2.50 \mathrm{~m}\) away from the grating, you see two neighboring bright fringes \(150 \mathrm{~mm}\) apart. What is the wavelength and the color of the light?

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