[填空题]
A laser beam is directed at the Moges 8jub6b(4l on, 380,000 km from Earth. The beam diverge5m3(q/ jqo *wrrz+jlm*rd ki+43awvl s at an anglejl 3qk5rr wd*4/amq*w vr jl(3+ mz+oi $\theta$ (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
