Atwo-dimensional flow field for a liquid is defined by v [ (x + 2y2)i (2x2- 3y)j] m/s, where x and y are in meters. determine the magnitude of the velocity of a particle located at (-2 m, 2 m), and its direction measured counterclockwise from the positive x axis.

the answer would be   dignified - apex

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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