Glen found three brands of earbuds that have the specifications he wants. The three pairs of earbuds looked a bit different from each other, but Glen knew they would perform similarly. Still, each company offered its earbuds at a different price. What economic concept does this situation represent?.

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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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