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How can the behavior of light be described as it leaves the vacuum of space and enters the Earth's atmosphere?

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Light waves slow down as they enter the Earth's atmosphere from space.


Light waves continue at the same speed as they enter the Earth's atmosphere from space.


Light waves speed up and then slow down as they enter the Earth's atmosphere from space.


Light waves slow down and then speed back up as they enter the Earth's atmosphere from space.

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  1. A
    read up on index of refraction

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    oobleck
  2. What the answer

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  3. how can light be described as it leave the vacuum of space and enter the earth atmosphere

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