[填空题]
A laser beam is directed at the Moon, 380,00czk5r9gp so.3 0 km from Earth. The yk5pm45f.,wp )fkfnnzpo ,m7 p:gg0hbeam diverges atg kfn,fo05hzn.pkp p, m:gym7 f wp)54 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
