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Lens Technologies

Lens Technologies. Microscopes. Invented by Johannes and Zacharias Jansen in 1590 Larger inverted image Used in study of cells and diseases. Refracting Telescopes: Galileo and Kepler. Reflecting Telescope: Newton’s Innovation. Reduced chromatic aberration. Modern Telescope.

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Lens Technologies

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  1. Lens Technologies

  2. Microscopes • Invented by Johannes and Zacharias Jansen in 1590 • Larger inverted image • Used in study of cells and diseases

  3. Refracting Telescopes: Galileo and Kepler

  4. Reflecting Telescope: Newton’s Innovation • Reduced chromatic aberration

  5. Modern Telescope • http://www.youtube.com/watch?v=0jPE7u3bz_E

  6. Binoculars • Two refracting telescopes • Total internal reflection • Longer light path results in better magnification

  7. Sight & Human Eye

  8. Structure – Human Eye • Cow Eye Dissection - http://www.youtube.com/watch?v=hZ4mUMsMfTQ&feature=related

  9. Focussing – Human Eye Ciliary muscles make the lens shorter and thicker to focus a nearby object Relaxed eye lens focusses on a distant object

  10. Eye vs. Camera

  11. Correcting Vision Using Lenses Common causes of poor vision: • Incorrect shape of eyeball • Incorrect shape of cornea • Hardening of the lens Corrected by: • Glasses • Contact lenses • Laser eye surgery

  12. Myopia – Near Sightedness • Long eyeball results in image formation in front of the retina • Rays spread again and result in blurry image

  13. Hyperopia – Far Sightedness • Short eyeball results in reaching of light rays at the retina before they converge • Blurry image

  14. Presbyopia • Symptoms often like Hyperopia (far sightedness) • Aging causes ciliarymuscles to be less flexbile and can no longer make the lens change shape to focus on objects at different locations • Solution is bifocals.

  15. Astigmatism • Cornea is oval shaped instead of spherical. • Causes light to focus on two or more spots.

  16. Night Vision Devices • You tube rescue with Night Vision Aid (40 sec. long) http://www.youtube.com/watch?v=u-6Vd1gc8AA • You tube night vision goggles (3 minutes long) http://www.youtube.com/watch?v=BOpJzH0XX-c

  17. Optical Illusions

  18. Optical Illusions

  19. Optical Illusions

  20. Optical Illusions

  21. Optical Illusions

  22. Optical Illusions

  23. Animated Optical Illusions • http://www.youtube.com/watch?v=lvvcRdwNhGM • http://www.youtube.com/watch?v=T5xtRdLOopU

  24. I “Speye” Activity & Homework • p. 514 - Complete Part 1 – 3 with a partner • p. 511 # 4, 5 and 8

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