uby laser emits pulses of coherent monochromatic light of wavelength
λ=694 nm, with a power of
35.0 kW. Each pulse lasts 0.800 millisecond and can be seen as a beam
5.00 mm in diameter, which fulfills Gauss’s condition. It is aimed at
the surface of the Moon, which, from the Earth’s surface, is between
354,994 km and 397,586 km away.
If we want the area illuminated at the Moon to be a disc of at least
6,500 meters in diameter, what should be the focal length of the
diverging lens used
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