[填空题]
A laser beam is directed atyabupp/4p 69p the Moon g6ig5 qx3o *rmvb*0mkreh392da(fbv, 380,000 km from Earth. The beam diverges atr9hxvvr3 b 5m3a(0f*ekm*6iogq dgb 2 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
