[填空题]
A laser beam is directez( wdf 8cvt23hd at the Moon, 380,0002wz*9/q5jirey o2 de2aa 6 vdi km from Earth. The beam diverges at a*iq2i j9 z/v6 r ye5ao2ewadd2n angle $\theta$ (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
