[填空题]
A laser beam is directed qj7vpsdd zs 5() z46teat the Moo,cinm(qx;glb;-u+nc vg4 g 1nn, 380,000 km from Earth. The beam diverges at a,qnm4v ngl+cg ; cub;xgi(-n1n 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
