Sunlight may appear white, but it's really made up of all the colors of the rainbow! Over 300 years ago, a famous scientist showed the world that this is true. Sir Isaac Newton placed a PRISM in a beam of sunlight, and colors were seen on a wall.
A prism is a triangular piece of glass. When light passes through a prism, the light bends and separates, and the different colors are scattered. You can do Sir Isaac's experiment today, and you do not need a prism. You can use something that did not exist in his day--a CD disk.
What You Need:
* a sunny day * a tissue
* a CD disk (It does not matter which one, but ask an adult for help in selecting one that is not valuable. Handle the CD carefully so it won't be harmed.)
What You Do:
1. Carefully and gently wipe off the shiny (mirror) side of the CD with the tissue. Make sure there are no fingerprints or smudges on it. Hold it only by the very edges, and DO NOT touch the surface of it.
2. Holding it by the edges, bring the CD outside. Face the mirror side toward the sun. Tip it back and forth.
3. WOW! You will see a beautiful RAINBOW of colors reflecting off the CD!
The Science Secret
Sir Isaac was able to see the rainbow colors red, orange, yellow, green, blue, indigo, and violet using a prism. If you could look at the surface of the CD through a microscope, you would see that it contains thousands of prisms. When the sunlight strikes these prisms, and reflects off them back to your eye, you see the same colors Sir Isaac saw many years ago. Raindrops act like prisms. That's why we often see a rainbow when the sun comes out after it rains!
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|Publication:||Fun For Kidz|
|Date:||Jul 1, 2017|
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