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Watch A Glass Of Water Make These Arrows Change Direction

Refraction is just the best.

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Physics Central explains: “When the arrow is moved to a particular distance behind the glass, it looks like it reversed itself."

Light travels through the air, through the glass, through the water, through the back of the glass, and then back through the air, before reaching the arrow.

Via youtube.com

But refraction alone doesn't explain why the arrow reverses. The glass of water is also acting like a magnifying glass.

Physics Central adds: “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.”

Check out a video of the illusion.

View this video on YouTube

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