[填空题]
A laser beam is directed at the Moon,pbl+qs 18/ o u:(4z ee1ov:et.mwxc.jxlh wy, 380,000(aeph) mps81 of r2ba: km from Earth. The beam diverges a1e)oa:bhfmp ps2a (8rt 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
