What special meaning does the slope of a graph of mass versus volume have

The slope represents the density of the substance been represented using the graph

Explanation:

The slope of a graph is calculated as the change in the y axis divided by the change in the X axis  which is known dy/dx  in the above question the Y axis is represented by the Mass of the substance and the X axis is represented by the volume of the substance hence

the change in mass ( dy ) / change in volume ( dx ) = density ( average ) of the substance. therefore the special meaning of the slope is that it represents the density of the substance being represented using the graph.

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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+15-35=-20

going in opposite directions