When two objects collide the momentum of the system of the system stays constant . this is a statement of
impulse
a change in momentum
newton's third law
the conservation of momentum

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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