[填空题]
A laser beam is directed at the Moon, 380km.., +e ;osln ds;y7iwwa nu4,000 km fro-jxw yz(tc6u*,nz 0 amm Earth. The beam diverges at zz 0 nuywa(x* ,6jct-man angle $\theta$ (Fig. 8–37) of $1.4\times10^{-5}$ rad What diameter spot will it make on the Moon? m
Post time 2025-2-18 20:00:22
