[填空题]
A laser beam is directed at the Moon, 380,000 km fraf,rvv9- 8l/gtgp p -qom Earth. 9h6mip b.iiiy80 :)k9 exzftn The beam diverges at an an i)i bhfkx.etzn98iymi:9 60 pgle $\theta$ (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
