Suppose you try to retrieve a coin that has fallen into an aquarium.
Looking down into the water, you see the coin and when you reach for it, it’s not where it appears to be. Why?
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? Best Answer
In order to see the coin, light has to pass through water and reach the coin. But water is more dense than air, so light does not just simply pass through water like it passes through air, but it’s refracted instead. That means when the ray of light gets to the surface of the water, it is taken off its straight trajectory and enters the water a little more angled, so the image of the coin is formed a litlle bit more to the surface.