[填空题]
A laser beam is directed at the Moon,ip7*(qk/7 xf+zvr yln 380,000 km frosom :hpvoc -6z )o-r(rm Earth. The beam diverges a)r6mvc: h(z-ooo s-p rt an 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
