[填空题]
A laser beam is directed a ezo f foclchw- x-(xh+8fq+48t the Moon, 380,000 km s e a5pe i,afk*ao1 ht-ak(*(rfrom Earth. The beam diverges at an angle1 hr(faiptaaos * k,-*( ake5e $\theta$ (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
