Question: While above water, a swimmers eyes are focused on a nearby boat. When the swimmer submerges, the underwater part of the boat will not be

While above water, a swimmer’s eyes are focused on a nearby boat. When the swimmer submerges, the underwater part of the boat will not be in focus even though it is the same distance away and the swimmer’s eyes have not been refocused. Why? Watertight goggles correct this. Why?

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