[填空题]
A laser beam is directed at the M8 nk2 fjpi 5pb0u i6wr((kr./;o6jidcnv u0ygoon, 380,000 km from Earth. Thbmz p4:1xqu+ :tcoz 4le beam diverges az:m :qt+uox 14zp4c blt 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
