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Try This! Experiment

In a swimming pool, look at your hand underwater. Notice how clearly you can see it. Now put your face in the water and look again. Why does your hand look blurry?

Clearly Focused   Clearly Focused

Explanation
When light waves go from the air into the surface of the eye, the light waves are bent. Your eyes depend on this bending to focus on the things you look at. When you open your eyes underwater, there is no air next to your eyes, so the light is not given the proper bend to allow your eye to focus on your hand.