[填空题]
A laser beam is directed at the Moon, 380,0b4zpj krodg33. 32o pr00 km from Earth. The bei f9k ;vebk0n v;p6x2xam diverges at an anglixxe;6;vb0 fpv 92nk ke $\theta$ (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
