[填空题]
A laser beam is directed at the Moon, 380,000 km fr*nmp(s+opr / e krp 8jls.xb:m4mnfdj6y1( +rom Earth. Tg jf)l( jvk;dl+t;h)gsu,gg 8p8t;m ohe beam diverges at an angle jl;olf8,vjk+;g8)m pdtsg gu (t;gh )$\theta$ (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
