Adart is thrown horizontally with an initial speed of 10 m/s toward point p, the bull's-eye on a dart board. it hits at point q on the rim, vertically below p, 0.19 s later.
(a) what is the distance ?
(b) how far away from the dart board is the dart released?

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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