Light Basics
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What is light?
Eelectromagnetic Radiation
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How does light travel?
Fast and Straight
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How FAST?
About 186,000 miles per second. In one second, light can go around the earth 7 times!
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How STRAIGHT?
Perfectly straight, until something bends it.
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There are THREE basic ways to CONTROL light:
- Block it with something (this makes a shadow)
- Reflect it (change its path with a mirror): This is called REFLECTION
- Bend it: Change its direction by making it pass into another transparent material of different density, like glass or water. This is called REFRACTION, and it's how lenses in our glasses work.
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