[填空题]
A laser beam is directed at the Moon, 380,000 km( hsh o4,da+,qujnu7xf(m lk d*s/cto d2+3cm froq z.b(om dn4o1m Earth. The beam diverges at an a(o mo.z1nqd4b ngle $\theta$ (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
