Answer
$D = 0.12~mm$
Work Step by Step
We can find the diameter of the aperture:
$w = \frac{2.44~\lambda~L}{D}$
$D = \frac{2.44~\lambda~L}{w}$
$D = \frac{(2.44)(500\times 10^{-9}~m)(1.0~m)}{0.010~m}$
$D = 1.2\times 10^{-4}~m$
$D = 0.12~mm$
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