Light Moves Straight

Do you know, how the light moves from one place to another, is it straight or curve? To answer that question, you need to do the following experiment.

Tools and Materials that you need:

• a piece of carton
• a flash light
• a string

The steps are:

1. Prepare the flashlight, string, and thick carton on the table
2. Make three equal supports that shape rectangular made of thick carton, and then in the middle of the carton is made a small hole.
3. Put one of the cartons on the table, then turn on the flashlight, take a look by yourself on the screen. Is there light coming out the carton? In what shape is the light?
4. Put the second carton at the back of the first carton, arrange the second carton's position until the light is coming out of the second carton, is also coming out of the second carton.
5. Then put the third carton just like the one that you did on the second carton.
6. When the light can go throught all three holes, pull a string on the cartons. What is the shape of string? Is it forming a straight line or not? What can you prove from this experiment?

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