[填空题]
A laser beam is directed at 2duxes-5ishi 3j v(*+ z5zx9cul4vtd the Moon, pg+*:ldn z yz2dl2i a- xs57qr380,000 km from Earth. The beam diverges at-+zsd*:pd zla 5yg7xq i rln22 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
