[填空题]
A laser beam is directed at the Moon, 380,000 km from Earth. The 1 :b-3j-hgo.mv xxfk nqx5v eif005okbeam (xt1 1+mzu8h9dkg3xh8 xz -byrges+zdiverges at an anglhk1dz-+ggz xyth3(xm u bzs 8 e+xr198e $\theta$ (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
