02 light and optics

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  • http://www.youtube.com/watch?v=KvOs_RBjLOk&feature=PlayList&p=34CAF189A5C0F7B9&playnext_from=PL&index=0&playnext=1
    http://www.youtube.com/watch?v=bPyWooEpwXw&feature=PlayList&p=34CAF189A5C0F7B9&playnext_from=PL&playnext=1&index=1
    http://www.youtube.com/watch?v=LjMvgPAyuqo&feature=PlayList&p=34CAF189A5C0F7B9&playnext_from=PL&playnext=2&index=2
  • http://www.youtube.com/watch?v=rS5LC2aH0c4
  • Sometimes there is mercury vapour inside the glass tube
  • Sometimes there is mercury vapour inside the glass tube
  • Sometimes there is mercury vapour inside the glass tube
  • Sometimes there is mercury vapour inside the glass tube
  • http://www.youtube.com/watch?v=gkNJurvXraY (laser cutting)
    http://www.youtube.com/watch?v=IaAiYIYXbIA&feature=related
    http://www.youtube.com/watch?v=bcdCRwfILQs
    http://www.youtube.com/watch?v=5pEXdMsl6SA&feature=related
    http://www.youtube.com/watch?v=KRDbpQjP4Vk&feature=PlayList&p=047A42CB2CC0A211&playnext_from=PL&index=10&playnext=3
  • http://www.youtube.com/watch?v=3fRPDdYSc7M&NR=1 (boeing laser)
  • http://www.youtube.com/watch?v=po3MMIRs6ws&feature=related
  • http://www.youtube.com/watch?v=po3MMIRs6ws&feature=related
  • http://www.youtube.com/watch?v=po3MMIRs6ws&feature=related
    Answer pg 469 Q #1, 5, 9, 10
  • 02 light and optics

    1. 1. Light travels in straight lines
    2. 2. Unlike heat or electricity, light can travel through space. Light is an electromagentic wave.
    3. 3. The electromagnetic spectrum
    4. 4. Visible light
    5. 5. Visible light INCREASING ENERGY
    6. 6. Wavelength and colour
    7. 7. Seeing colour
    8. 8. Pinhole camera
    9. 9. How is light produced? Luminous source Produces its own light Vs. Non-luminous source Does not produce its own light
    10. 10. 1) Light from incandescence Producing light as a result of high temperature Heated tungsten wire glows
    11. 11. 2) Light from electric discharge Producing light by passing an electric current through a gas LIGHTNING NEON LIGHTS
    12. 12. 3) Light from phosphoresence Producing light by the absorption of UV light resulting in the emission of visible light over an extended period of time
    13. 13. 4) Light from fluorescence Producing light by the absorption of UV light resulting in the immediate emission of visible light
    14. 14. 4) Light from fluorescence
    15. 15. 4) Light from fluorescence
    16. 16. 5) Light from chemiluminescence Producing light as the result of a chemical reaction with little to no heat produced
    17. 17. 5) Light from chemiluminescence -2 chemicals, 1 in a narrow small glass vial -Bending the stick breaks the vial, causing chemicals to mix -Chemical reaction produces visible light
    18. 18. 5) Light from chemiluminescence APPLICATIONS: -Hazardous environments where sparks can be dangerous -Underwater diving -Camping -Law enforcement -Military -Entertainment (concerts, dance halls, amusement parks)
    19. 19. 6) Light from bioluminescence Light produced in living organisms as the result of a chemical reaction with little or no heat produced
    20. 20. 6) Light from bioluminescence
    21. 21. 6) Light from bioluminescence
    22. 22. 7) Light from triboluminesence Light produced by friction as a result of scratching, crushing, or rubbing certain crystals
    23. 23. 8) Light from a Light-Emitting Diode (LED) Light produced by an electric current flowing in semiconductors Differs from incandescent bulbs -Does not produce much heat -Does not require a filament -More energy efficient Semiconductor = material that allows an electric current to flow in only one direction
    24. 24. 8) Light from a Light-Emitting Diode (LED)
    25. 25. LASERS LASER = Light Amplification by Stimulated Emission of Radiation
    26. 26. Lasers Vs. Incandescent bulbs Incandescent bulbs emit electromagnetic waves of many different energy levels
    27. 27. Lasers Vs. Incandescent bulbs A laser produces electromagnetic waves of exactly the same energy level In lasers, electromagnetic waves 1)Travel in exactly the same direction 2)Are exactly in unison
    28. 28. APPLICATIONS OF LASERS -manufacturing -astronomy* -research -entertainment -military -media technology *Earth-moon distance measured to be 385 000km with an accuracy of 3cm!
    29. 29. APPLICATIONS OF LASERS
    30. 30. APPLICATIONS OF LASERS
    31. 31. Land – reflects laser light back into the head Pit – scatters light in all directions Reflected light then converted into 0’s and 1’s (binary data).

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