What must occur for work to be done on an object? a. force must be applied in a direction opposite to the motion of the object. b. no net force should be applied to the object. c. a force must hold the object in place. d. the object must move.

The answer is D, The Object must move.

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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