Two cars A and B are moving along a straight road in the same direction with velocities of 25km/h and 30km/h , respectively. Find the velocity of car B relative to car A

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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i think its c if i'm wrong