[填空题]
A laser beam is directed at the Moon, 380, 6 nnp6w1*pk1q(+hq eltyjxj;000 km from Earth. The beam diverges m-j1p: kld/v3z 4v ofrat an angle 4kz d3v:o /jfr1mvlp-$\theta$ (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
