Which of the following are required to create a mechanical wave? A. a medium to carry the wave
B. a vacuum
C. empty space
D. an object to receive the wave

the answer is c

Explanation: In contrast, light waves CAN travel through a vacuum, and do not require a medium. In empty space, the wave does not dissipate grow smaller no matter how far it travels, because the wave is not interacting with anything else. However, light can also travel within some materials, like glass and water.

he . if i may ask what i your question exactly?

explanation:

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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