To calculate the area of the front surface of a box, you a. add the length to the height b. add twice the length to twice the height c. multiply the length by the height d. multiply the length by the height then divide by two

B, mulitiply the length by the height  

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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