Answer
$\theta=8.46^{\circ}$
Work Step by Step
$\theta=\sin ^{-1}\left(\frac{m \lambda}{d}\right)\\=\sin ^{-1}\left(\frac{2\left(460 \times 10^{-9} \mathrm{~m}\right)}{6.25 \times 10^{-6} \mathrm{~m}}\right)\\=\sin ^{-1}(0.1472)\\=8.46^{\circ}$.
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