[填空题]
A laser beam is directedq)o) 4fqo zt;l3 v+vgy at the Mooi3- zt8ou5tqquopb p*4(7hfk n, 380,000 km from Earth. The beam diverges at an8u-q7z*4h qk5u po 3 pfiottb( 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
