Which of the following statements is true? a. instantaneous acceleration is always changing. b. an object that is accelerating is always changing direction. c. an object at rest has an instantaneous acceleration of zero. d. an object that is accelerating is always changing speed.

wavelength divides in half and speed stays the same.

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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