The answer is 0.0096m.
From Rayleigh criterion, angular separation for between two points just resolved is [tex]$\theta=1.22 \frac{\lambda}{D}=\frac{1.22 \lambda_{a}}{n D}$[/tex]
[tex]$\begin{aligned}&\lambda_{a}=555 \mathrm{~nm} \\&L=120 \mathrm{~m} \\&D=2.5 \mathrm{~mm} \\&n=1.36\end{aligned}$[/tex]
If the separation between points is [tex]$x, \frac{x}{L}=\frac{1.22 \lambda_{a}}{n D}$[/tex]
then for the human eye, [tex]$x=\frac{1.22 L \lambda_{a}}{n D}=0.024 m$[/tex]
for the eagle's eye, [tex]$D=6.2 \mathrm{~mm}$[/tex]
and linear separation between just resolved points is [tex]$x=\frac{1.22 L \lambda_{a}}{n D}=0.0096 \mathrm{~m}$[/tex]
What is linear separation?
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