What is inertia??

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Intertia is defined as the inability of changing its position of uniform motion or rest by itself.It needs external force to change its position.

it is the property of all body

Explanation:

it is a property to retain its state of rest or state of uniform motion in a straight line

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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