[填空题]
A laser beam is directed at the Moon,9+81svz2q6lqgkoe ;t).pzda ev qs2y 380,000 km froty,8xcm.fqjy8q.3/*y exwnfrm: b cr/ct2y )m Earth. The beam diverges at an anglemm:tq82. eb//cx,xyrjrfy yct.* w n83fcq y) $\theta$ (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
