Answer
$\lambda=588nm$
Work Step by Step
We know that
$d=m(\frac{\lambda}{2})$
This can be rearranged as:
$\lambda=\frac{2d}{m}$
We plug in the known values to obtain:
$\lambda=\frac{2(0.233\times 10^{-3})}{792}=588nm$
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