A box is at rest on a table. What can you say about the forces acting on the box? The upward and the downwardare balanced.
applied force
frictional force
normal force

drag force
gravitational force
tension

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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e/c, where e is its total energy