[填空题]
A laser beam is directed at t/j68jt3sxq 7vh7h6 oy kl. heyhe Moon, 3;v)xbfmg3 wt9l.od x580,000 km from Earth. The beam diverges at an anglg .xb ft9o)l vmd;3xw5e $\theta$ (Fig. 8–37) of $1.4\times10^{-5}$ rad What diameter spot will it make on the Moon? m