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Properties of Light

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Radiation NEED NO MEDIUM Photons Electro Magnetic EM waves generate electrical and magnetic fields How fast do EM Waves Travel EM waves travel at the speed of light. – PowerPoint PPT presentation

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Title: Properties of Light


1
  • Properties of Light

2
Electromagnetic Waves
  • Electromagnetic Waves - energy-carrying waves
    caused by vibrating electrons
  • Also know as All EM Waves are
  • Light TRANSVERSE!!!
  • Radiation NEED NO MEDIUM
  • Photons

3
Electro Magnetic
  • EM waves generate electrical and magnetic fields

4
How fast do EM Waves Travel
  • EM waves travel at the speed of light.
  • It is 300,000 kilometers per second or 186,000
    miles per second.

5
The Electromagnetic Spectrum
  • Radio Waves - communication
  • Microwaves - used to cook
  • Infrared - heat waves
  • Visible Light - detected by your eyes
  • Ultraviolet - causes sunburns
  • X-rays - penetrates tissue
  • Gamma Rays - most energetic

6
The Electromagnetic Spectrum
  • A range of light waves extending in wavelength
    from radio waves to gamma rays

7
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8
  • The Visible Spectrum
  • A range of light waves extending in wavelength
    from about 400 to 700 nanometers.

9
Reflection
  • Most objects we see reflect light rather than
    emit their own light.

10
Refraction
  • Refraction is the bending of light when it passes
    from one transparent medium to another.
  • Refraction is caused by differences in the speed
    of light in the media.

11
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12
Diffraction
  • Bending of Light around an object

13
Diffraction in Space
14
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15
Dispersion...
  • is the separation of white light into pure
    colors (ROY G. BIV).
  • Dispersion Examples
  • Prisms
  • Diffraction Gratings
  • CDs
  • Raindrops

16
Converging Lenses
  • A converging lens is thicker in the middle than
    the edges.
  • Rays of light that are initially parallel are
    made to converge (come together)
  • Rays that move through the center move slower
    than rays moving through the edges

17
Diverging Lens
  • A diverging lens is thinner in the middle than
    the edges.
  • Rays of light are made to diverge (move apart)
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