3. A copper rod is 3 m long at a certain temperature. Calculate its length for a temperature rise of 100K if the linear expansivity of copper is 17 x 10^-6

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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answera compound;