On the Moon's surface, lunar astronauts placed a corner reflector, off of which a laser beam is periodically reflected. Thedistance 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 3.84 x 108 m, and Earth's atmosphere(which varies in density with altitude) is equivalent to a layer 30.0 km thick with a constant index of refraction n = 1.000293.What is the difference Ar in travel time for light that travels only through space to the moon and back and light that travelsthrough the atmosphere and space?At ==3.909 x10-8IncorrectS

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