Answer
$d=6.0 \times 10^{-6} \mathrm{~m}$
Work Step by Step
We subtract the first equation from the second to obtain $0.1 d=\lambda$, or $d=\lambda / 0.1=\left(600 \times 10^{-9} \mathrm{~m}\right) / 0.1=6.0 \times 10^{-6} \mathrm{~m}$.
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