A jogger runs 186 meters westward, then 210 meters eastward, then 156 meters westward, and finally 84 meters eastward. For the motion, what is the distance moved?

What is the magnitude and direction of the displacement?

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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