[填空题]
A laser beam is directed at the Moon, 380,00e (5b j4kn.p(:wfhbzx 0 km from Earth. rqdd 4l:yy w.8,au+p lThe beam diverges at an ,y d.rd+pya: 8q llw4uangle $\theta$ (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
