Question: Light from a He-Cd laser ((lambda=442 mathrm{~nm})) passing through a two-slit diffraction grating forms a pattern on a screen (2.0 mathrm{~m}) away from the grating.

Light from a He-Cd laser $(\lambda=442 \mathrm{~nm})$ passing through a two-slit diffraction grating forms a pattern on a screen $2.0 \mathrm{~m}$ away from the grating. If the first bright fringe is located at a linear distance $y=22.1 \mathrm{~mm}$ to the left of the central bright fringe, what is the slit spacing? What is the position of the second dark fringe?

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