[填空题]
A laser beam is directed at the Moon, 380,000 km from Eanw-mi9gf.+n mr ;d2ag rth. The beam didns(8 t xdvs386 / f.-heweziyverges at an a8ds3hy(8x z w6de -/tvei f.nsngle $\theta$ (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
