Pinhole Cameras Converging & Diverging Lenses. Pinhole Image

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  • Slide 1
  • Pinhole Cameras Converging & Diverging Lenses
  • Slide 2
  • Pinhole Image
  • Slide 3
  • Pinhole Camera Image is upside down and left to right reversed Size of image is determined by distance from pinhole to screen/film The smaller the pinhole, the clearer the image & the dimmer the image
  • Slide 4
  • Pinhole Camera Picture
  • Slide 5
  • Slide 6
  • Pinhole Viewing of Partial Eclipse
  • Slide 7
  • Shape of a Lens
  • Slide 8
  • Types of Lenses
  • Slide 9
  • Convex Lens Terms
  • Slide 10
  • Three Rays to Locate Image Ray parallel to axis bends through the focus. Ray through the focus bends parallel to axis. Ray through center of lens passes straight through.
  • Slide 11
  • Characterizing the Image Images are characterized in the following way Virtual or Real Upright or Inverted Reduced, Enlarged, Same Size
  • Slide 12
  • Object Beyond 2f Image is Real Inverted Reduced
  • Slide 13
  • Object at 2f Image is Real Inverted Same size
  • Slide 14
  • Object Between 2f and f Image is Real Inverted Enlarged
  • Slide 15
  • Object at F No Image is Formed!
  • Slide 16
  • Object Closer than F Image is Virtual Upright Enlarged
  • Slide 17
  • Converging Lens Images
  • Slide 18
  • Eye Optics Accommodation Shockwave Applet
  • Slide 19
  • Normal Eye In the normal eye, the cornea/lens system project an inverted, focused image on the retina which is the screen.
  • Slide 20
  • Myopia -- Nearsightedness In a nearsighted eye, the image is focused in front of the retina. A diverging (concave) lens is used to cause the image to be focused at the retina.
  • Slide 21
  • Hyperopia -- Farsightedness In a farsighted eye, the image is focused behind the retina. A converging (convex) lens is used to cause the image to be focused at the retina.
  • Slide 22
  • Astigmatism In astigmatism, the cornea is irregularly shaped & the light focuses at multiple points. The result is blurry or multiple images.
  • Slide 23
  • Concave Lens Ray Tracing Ray parallel to axis refracts as if it comes from the first focus. Ray which lines up with second focus refracts parallel to axis. Ray through center of lens doesnt bend.
  • Slide 24
  • Image Formed by Concave Lens Image is always Virtual Upright Reduced
  • Slide 25
  • Concave Lens Image Distance As object distance decreases Image distance decreases Image size increases
  • Slide 26
  • Image Characteristics CONVEX LENS IMAGE DEPENDS ON OBJECT POSITION Beyond F: Real; Inverted; Enlarged, Reduced, or Same Size Closer than F: Virtual, Upright, Enlarged At F: NO IMAGE CONCAVE LENS IMAGE ALWAYS SAME Virtual Upright Reduced