Nature of Light

• Ref p326 text
  • light is a form of energy visible to the human eye
  • sometimes light displays the properties of particles (photons) and sometimes properties of waves (electromagnetic radiation).
    • light as an electromagnetic wave discussion
      • what is an electromagnetic wave
      • relationship between wavelength and frequency
      • ref p326 electromagnetic spectrum
      • http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html
  • light travels in straight lines (usually) called linear propagation
    • terminology p326 bottom
      • ray
      • beam
      • diverging
      • converging
      • parallel
• ref p327 Text
  • speed of light (electomagnetic radiation through a vacuum) c=3.0x10⁸ m/s
  • determine relationship between wavelenght and frequency of a particular colour of light