Light experiment with laser pointer
The experiment requires a transparent plastic bottle. Drill a hole on the side about 5 to 10 cm above the bottom. Its diameter should be about half an inch. You can drill carefully with a drill bit, or you can heat an old knitting needle on a candle flame and use it to melt a hole in the plastic. Let the adults help you solve this problem! Place the plastic bottle on a sturdy box or on the edge of a table. A stream of water will flow out of the cave after a while. So set up a bucket so that it can receive water.
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But first you must position the Laser pointer on the other side of the hole. To do this, place the laser pointer horizontally on a book, wooden block, or other surface so that it is exactly at the height of the hole in the bottle. You can use modeling clay to stabilize it. Now you can turn on the laser pointer. To keep the power on, you can use a clothespin holding the power button instead of your hand. Fill the bottle with water and adjust the laser pointer so that it hits the hole that is now flowing out of water. In this way, the laser is directed into the water jet, and only when the jet breaks down into water droplets or the jet hits the bottom of the bucket will it be shot again.
The experiment was first shown in Geneva in 1841. At that time, sunlight or the strong light of carbon arc lamps were used to replace lasers that had not yet been invented. For a long time, the light guide was still a gimmick, building a spectacular "light well" in which the water jet was illuminated by light. Since this phenomenon applies not only to water, but also to many transparent materials, light can also be transmitted through glass fibers. This leads to important applications: doctors can guide special flexible glass fibers, for example through the mouth into the stomach or lungs. The light is illuminated by one optical fiber, and the second optical fiber is used to transmit the image from the inside of the body to the outside.
2021-09-28 09:40:22
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