What best describes how the light ray must be traveling?
A from medium y into medium x
B faster in medium y than in medium x
C from medium x into medium y
D faster in medium x than in medium y

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