[填空题]
A laser beam is directed at the Moon, 380,00l;wr*.syjlcoxh ov 3 6e;-n; n-q4h cx0 km frv4 eo0(nartopw +*bg1q bm5+yom Earth. The beam diverges at a1(0r+agqovyt5w4b np+* m boen 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
