[填空题]
A laser beam is directed at theh-ko 4:tj1 p8eop ny ja;wbz+l8w-(xl Moon, 380,000 km fegmgs 4*pfu +u,d1j m;rom Earth. The beam diverges at anf;d mm,puu*e 1+g4sj g 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
