[填空题]
A laser beam is directed at the e(xk c7 yilb2(Moon, 380,000 km from E / 6s8- qlk//yvt t7djhiaztqc:q1ux5arth. The beam diverges at an angl v/ttt7s 1l65: 8/k/ chy- qujxaqidzqe $\theta$ (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
