[填空题]
A laser beam is directed at the Moon, 380,000 km from9rlalm/ vx2 +nny:q4 y Earth. The b.y6rp5 hry2+sx f3zbjeam diverges at an asbr2yjhx.5zry3+ p6f ngle $\theta$ (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
