Solution:
$$
\begin{aligned}
&\text { Limit of resolution, } \\
&\theta_{R}=1.22 \frac{\lambda}{d} ; \\
&\lambda=600 \times 10^{-9} \mathrm{~m} \\
&d=2 \mathrm{~m} \\
&\theta_{R}=\frac{1.22 \times 600 \times 10^{-9}}{2} \\
&\theta_{R}=3.66 \times 10^{-7} \mathrm{rad}
\end{aligned}
$$