[填空题]
A laser beam is directed at the Moon, 380,000 km from Earth. The beam x3:ra 3o ;qipjmv,pk 4diverd5stm/ow (ek o*hix;x;o .qm(mlxm ;( ges akx xo i (;edmm oq(; wx.5l*(mmo/s;htt an 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
