Using a diffraction grating with 200 slits (/ mathrm{mm}) to create a diffraction pattern on a screen

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Using a diffraction grating with 200 slits \(/ \mathrm{mm}\) to create a diffraction pattern on a screen \(2.00 \mathrm{~m}\) away from the grating, you see bright fringes \(170 \mathrm{~mm}\) apart. What is the wavelength of the light?

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