Light from a helium-neon laser 630nm is incident on a, Ask an Expert

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Light from a helium-neon laser (? = 630nm) is incident on a diffraction grating and then illuminates a screen that is 10 m away. If the bright diffraction fringes near ? = 0 are spaced 0.7 m apart, what is the spacing between the slits in the grating?

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