[填空题]
A laser beam is directed at tj, iw:t7vmm8i-bdp8the Mo 35iprk*:wiygg pi 61zon, 380,000 km from Earth. The beam diverges a3zp :5 i 61p*rkiiwgygt an 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
