Amazing water trick how is it done

In the experiment that you just completed, light traveled from the air, through the glass, through the water, through the back of the glass, and then back through the air, before hitting the arrow. Anytime that light passes from one medium, or material, into another, it refracts. To explain this, you must think about the glass of water as if it is a magnifying glass. When light goes through a magnifying glass the light bends toward the center. Where the light all comes together is called the focal point, but beyond the focal point the image appears to reverse because the light rays that were bent pass each other and the light that was on the right side is now on the left and the left on the right, which makes the arrow appear to be reversed.

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You should end up with a square about 3 inches on a side. Slowly add more water to the blue jar until you can see a bulge of water over the rim of the jar. This part is very tricky. You may want to practice it a few times over the sink with a jar of plain water.

Pick up the blue jar and turn it straight upside-down. You don't need to put your hand on the card. The water will hold the card in place. Just flip the jar over. Don't hesitate. If the jar is tilted but not turned over completely, the water will gush out and make a mess. Lay the square card carefully onto the top of the blue jar. Tap the card gently with your finger. Don't poke it.

You want the card to be flat and form a seal with the water and the jar. Put the upside-down blue jar right on top of the red jar. Have someone hold onto both jars while you very slowly and carefully pull the card out. What happens? What color is the water in the top jar? What color is the water in the bottom jar? Empty both jars. Rinse them.