[填空题]
A laser beam is directed at the Moon, 380,000aa9j4vk ujg i7n z1*+gn+ qn8zp3g.lf km from Earth. The beam1. kuwm n 9o/qgp (pet59cagd0 diverges at we 1 9pga/n9pg5 o.0tmud(kcqan 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
