[填空题]
A laser beam is directed at vgej(-(bhk fx*j9* m:qodqs 3the Moon, 380,0007r v7 ny3/rgn ieijxa54 df8(q km from Earth. The beam diverges arq ynj75 87igr/x43(eiavdf n t 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
