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Ag Experiment #5 Model Eye

Copied from the Daily Oklahoman

Here is how to make a model or an eye, which works like a small camera.

You'll need:

  • Small paper cup (not plastic or foam)
  • Rubber band
  • Wax paper
  • Straight pin
  • Bright light (lamp works best)

Do this:

  1. Attach a piece of wax paper to the top of the cup with the rubber band.
  2. Use the pin to put a small hole in the center of the bottom of the cup.
  3. Turn off the room lights and point the bottom of the cup toward the light.
  4. Stand about an arm's length from the light and move the cup slowly toward the light.
  5. At a certain distance, you will see an image of the lamp on the wax paper.

What happened?

-When you hold the cup the right distance away from the lamp, you can see an upside down image of the lamp on the wax paper. Just as your eye takes in light through the small hole in your eye (pupil) and focuses the image on the back wall of the eye, the cup with the hole and wax paper models the process. The image appears upside down and your brain interprets the image so it seems right side up.

Think about this?

  • Are eyes important on livestock? Why?
  • Do you think there are livestock that have poor vision?

Try this:

  • What happens if you make the hole in the cup larger?
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