[填空题]
A laser beam is direc8updph( *+l4e zl : r*fk49mjgf) wib0oj3ro vhe c,t n2(gz ,b1bai,cted at the Moon, 380,000 km from Earth. The beam diverges at ane, tjnbbg3a v oh102,r, (ozci 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
