The far-field is defined by

\(L \gt \gt \frac{area}{\lambda}=\frac{\frac{1}{4} \pi d^2}{\lambda}=\frac{\pi (10^{-3}m)^2}{4(546*10^{-9}m)}=1.4m\)

\(L=50cm\) is the near-field.

\(L=1m\) is the near-field.

\(L=5m\) is the far-field.