[填空题]
A laser beam is directed at the ); gzbo8wza-twui( (ir4 o/ msMoon, 380,0 9(*iava. lni(t)hc ea00 km from Earth. The beam diverges at an angnie( c(* thvl)9ai.aale $\theta$ (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
