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A silver coin sits on the bottom of a swimming pool that is 4 meters deep....

A silver coin sits on the bottom of a swimming pool that is 4 meters deep. A beam of light reflected from the coin emerges from the pool making an angle of 20 degrees with respect to the water’s surface and enters the eye of an observer. Extend this ray, which goes from the water-air surface to the eye, straight back until it intersects with the vertical line drawn through the coin. What is the apparent depth of the swimming pool to this observer? The index of refraction of water is 1.33 and air is 1.00.

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