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What We See



What We See
Reading Level
     edHelper's suggested reading level:   grades 6 to 8
     Flesch-Kincaid grade level:   5.95

Vocabulary
     challenging words:    spectrum, electromagnetic, phenomenon, covering, demonstration, shutter, retina, based, opening, angles, works, divide, pupil, visible, itself, cornea


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What We See
By Sharon Fabian
  

1     When we look at something, say a waving flag, there are two things that affect what we see, besides the flag itself. One thing is light waves; the other thing is our eyes.
 
2     You might remember that light waves are the part of the spectrum of electromagnetic waves that is called visible light. Visible light comes in all of the colors of the rainbow, from red to violet. All of these colors mixed together give us everyday white light.
 
3     Our eyes pick up light in much the same way that a camera does. Light enters our eyes through the cornea, which is the clear covering over the front of the eye. The cornea bends, or refracts, the light. Then the iris, the colorful part of the eye, opens or closes a little to let just enough light through the pupil, which is an opening in the iris. The iris works like the shutter on a camera. The light then passes through a lens behind the pupil, which focuses the light on the part of the eye called the retina. The retina changes the light energy into electrical energy which carries the message to the brain.

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