Properties of Light

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• Properties of Light

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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

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Electro Magnetic

• EM waves generate electrical and magnetic fields

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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.

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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

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The Electromagnetic Spectrum

• A range of light waves extending in wavelength
  from radio waves to gamma rays

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

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Reflection

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

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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.

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Diffraction

• Bending of Light around an object

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Diffraction in Space
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Dispersion...

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

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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

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Diverging Lens

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