[填空题]
A laser beam is directed at the Moon, 3q41*: 5tjk w1 mtedsqtzzge7)80,000 kx0hra6 iifvkr5 :*euk2 kz:k5m from Earth. The beam diverges at an angle ze:i:vuk5 fkh50rkaikr2 * 6x$\theta$ (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
