The number of lines per millimeter is given as 233 lines/mm. To find the grating spacing in meters, we use the formula:
\[
d = \frac{1 \text{ mm}}{233 \text{ lines}} = \frac{1 \times 10^{-3} \text{ m}}{233} \approx 4.295 \times 10^{-6} \text{ m}
\]
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