Set a coin on a flat surface like a table. Place the base of a clear drinking glass over the coin. Fill the glass with water. Can you still see the coin through the side of the glass? It’s disappeared!
When the cup is filled with water, the penny
disappears. This happens because of refraction. When light bounces off of an
object, it reaches our eyes and we see the object. As light travels through the
sides of the glass and the water, it’s refracted and never reaches our eyes,
which makes the penny seems to disappear.
Why
- Light bends when it passes from one medium (water) into another medium of a different density (air).
- This bending of light, called refraction, causes the apparent position of the coin to change to a shallower position.
- The light bends when it passes from water to air on top of the water.
- It does the same thing when it passes through the glass, making the coin appear to be closer to you.
- As a result, you see two images of the coin.
Why the sky is blue?
How to
control light with water?
Observe the laminar flow water stream coming out of the bottle. When the water is in laminar flow the water stream acts just like fiber optic and carries the light. When the light beam hits the water stream, the laser light gets reflected inside the stream.
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