[填空题]
A laser beam is directed at the Moon, 380,000 km from 0tpct 9y70q bjEarth. The beam divergesqrheowr0h5vi2+( u)p (k0epu1a sf8 r at an an q0rsuh wrr28+ek()p0 vi( 5hue1 ofapgle $\theta$ (Fig. 8–37) of $1.4\times10^{-5}$ rad What diameter spot will it make on the Moon? m