[填空题]
A laser beam is directed at the Moon, 38mm;w glls2)y1zu 0az( 6 ive9v0,000 km from Earth. ;;5ytab;l4t1knjzr ig+a r)lThe beam diverges at an angley5l rirtnl 1a4t j;)a ;;bg+kz $\theta$ (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
