The eficiency of a
simple machine can never be 100% why?​

Systems always tend toward a state of decreasing order unless more energy is provided into the system to counteract this tendency.

good looking response

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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