[填空题]
A laser beam is directedhue2b gd /60y.jnuf 8 jvr71iz at the Mvi-kg lqzd2 9j hh h9 z8*yu*.q8edmj7oon, 380,000 km from Earth. The beam diverges at an anglejdey.-hzi u**vhm99g7qzh8l8 dj q k2 $\theta$ (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
