Above: A Laser
The difference between a laser and regular light is that a laser only shines light in one single direction, like this:
A light saber, like in Star Wars movies, is a type of laser.
Lasers are very sharp and some can cut through metal. Doctors use lasers in surgery, too.
A regular light bulb, or the sun, is very different. Light normally spreads in all directions. For example, the sun shines light all around it, so that every planet in our solar system can see the sun, and if we were in another solar system or galaxy and had a telescope, we could probably see our sun.
A regular light bulb is just like the sun. Light from a light bulb spreads in all directions.
Understand??? If you have any questions, please leave a comment.
I'll post more about light tomorrow.
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