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Pinhole Cameras Converging & Diverging Lenses

Pinhole Cameras Converging & Diverging Lenses. Pinhole Image. 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. Pinhole Camera Picture.

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Pinhole Cameras Converging & Diverging Lenses

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  1. Pinhole CamerasConverging & Diverging Lenses

  2. Pinhole Image

  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

  4. Pinhole Camera Picture

  5. Pinhole Camera Picture

  6. Pinhole Viewing of Partial Eclipse

  7. Shape of a Lens

  8. Types of Lenses

  9. Convex Lens Terms

  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.

  11. Characterizing the Image • Images are characterized in the following way • Virtual or Real • Upright or Inverted • Reduced, Enlarged, Same Size

  12. Object Beyond 2f • Image is • Real • Inverted • Reduced

  13. Object at 2f • Image is • Real • Inverted • Same size

  14. Object Between 2f and f • Image is • Real • Inverted • Enlarged

  15. Object at F • No Image is Formed!

  16. Object Closer than F • Image is • Virtual • Upright • Enlarged

  17. Converging Lens Images

  18. Eye Optics Accommodation – Shockwave Applet

  19. Normal Eye • In the normal eye, the cornea/lens system project an inverted, “focused” image on the retina – which is the screen.

  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.

  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.

  22. Astigmatism • In astigmatism, the cornea is irregularly shaped & the light focuses at multiple points. • The result is blurry or multiple images.

  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 doesn’t bend.

  24. Image Formed by Concave Lens • Image is always • Virtual • Upright • Reduced

  25. Concave Lens Image Distance • As object distance decreases • Image distance decreases • Image size increases

  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

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