On the moon's surface, lunar astronauts placed a corner reflector, off which a laser beam is periodically reflected. the distance to the moon is calculated from the round-trip time. the earth's atmosphere slows down light. assume the distance to the moon is precisely 3.84Ă10^8 m, and earth's atmosphere (which varies in density with altitude) is equivalent to a layer 40.0 km thick with a constant index of refraction n=1.000293. what is the difference in travel time for light that travels only through space to the moon and back and light that travels through the atmosphere and space?
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