Answer
$L = 0.78~m$
Work Step by Step
We can find the required distance $L$:
$w = \frac{2.44~\lambda~L}{d}$
$L = \frac{w~d}{2.44~\lambda}$
$L = \frac{(0.010~m)(0.12\times 10^{-3}~m)}{(2.44)~(633\times 10^{-9}~m)}$
$L = 0.78~m$
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