2. A helicopter heads due North and has an airspeed of 80 ms 1. The wind is blowing to the West at 30 ms-'. By means of calculation determine the magnitude and direction of the helicopter's velocity relative to the ground. answers and explain

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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