In the figure seven charged particles are fixed in place to form a square with an edge length of 1.2 cm. How much work must we do to bring a particle of charge +6e initially at rest from an infinite distance to the center of the square?

a straight line sloped

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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e/c, where e is its total energy