[填空题]
A laser beam is directed at the Moon, 380,000 ky8 5pqzytnjapf2 (xn ;km95up) g bl2;m from Earth. Th.cz3 t37p +lhi0ia7jy 3cwopsn dou5- e beam diverges at an angle 70szco dn3 p+7ywih- i. tu3al5cj3p o$\theta$ (Fig. 8–37) of $1.4\times10^{-5}$ rad What diameter spot will it make on the Moon? m