The eye

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  • Created by: blloob1
  • Created on: 03-05-14 16:43
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  • The Eye
    • near and far points
      • The near point is the closest distance that the eye can focus on
        • for adults thats 25cm
      • As the eye focuses n closer objects its power increases
        • the lens changes shape and the focal length decreases
          • but the distance between the lens and the image stays the same
    • cameras
      • light from the object travels to the chamera  and is reflected by the lens forming the image on film
        • the image on the film is real because the light rays actually meet there
          • The image is smaller then the object because  the objects a lot futher away than the focal length lens
            • the image is inverted
            • the image is inverted
  • basic structure of the eye
    • The Eye
      • near and far points
        • The near point is the closest distance that the eye can focus on
          • for adults thats 25cm
        • As the eye focuses n closer objects its power increases
          • the lens changes shape and the focal length decreases
            • but the distance between the lens and the image stays the same
      • cameras
        • light from the object travels to the chamera  and is reflected by the lens forming the image on film
          • the image on the film is real because the light rays actually meet there
            • The image is smaller then the object because  the objects a lot futher away than the focal length lens
              • the image is inverted
              • the image is inverted
    • Cornea
      • is a transparent window with a convex shape
      • It also has a high relective index
      • the cornea dose most of the eyes foucusing
    • Iris
      • the coloured part of the eye
      • made up of muscels that controle the size of the pupil the hole in the middle of the iris
        • this controles the intensity of light that enters the eye
    • The lens
      • the lense changes shape to focus lgiht from objects at varying distances
      • its connected to the ciliary muscles by the suspensory ligaments and when the ciliary muscles contract tenshion is released  and the lens takes on a flat more spherical shape
        • when they relax the suspensory ligaments oull the lens into a thinner flatter shape
    • Retina
      • which is covered  in  light sensitive cells
        • These cells detect light and send signals to th brain to be interprited
      • images are formed on the retina
  • the lense changes shape to focus lgiht from objects at varying distances
  • The far point is the furthest distance that the eye can focus comftably
    • for normal sighted people thats infinity

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