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If you pass white light through a prism, it separates into its component colors. - PowerPoint PPT Presentation


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long wavelengths. short wavelengths. If you pass white light through a prism, it separates into its component colors. Spectrum. R . O . Y . G . B . I . V !!. Dispersion.

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if you pass white light through a prism it separates into its component colors

long wavelengths

short wavelengths

If you pass white light through a prism, it separates into its component colors.

Spectrum

R.O.Y. G. B.I.V !!

dispersion
Dispersion
  • The separation of light into colors arranged according to their frequency, by interaction with a prism or diffraction grating.
making light
Making Light
  • Incandescence
    • involves the vibration of entire atoms
    • the sun, fire and light bulbs
  • Luminescence
    • involves only the electrons
    • occurs at lower temperatures
    • florescent lights, neon light, mercury-vapor street lights, television screens and computer monitors, fire-flies
what is incandescence
What is incandescence?
  • Emission of light by a solid that has been heated until it glows, or radiates light.
  • When an iron bar is heated to a very high temperature, it initially glows red, and then as its temperature rises it glows white.
  • Incandescence is heat made visible – the process of turning heat energy into light energy (Black Body Radiation)
other examples of incandescence and its uses
Other examples of incandescence and its uses
  • The bright white colors of fireworks are examples of incandescence.
  • Metals, such as magnesium, are heated to white-hot temperatures during combustion.
  • The other colors produced in pyrotechnical displays employ luminescence, rather than incandescence.
double rainbow
Double Rainbow
  • Raindrops reflect the sun’s light noticeably inward from the rainbow arc, and correspondingly out of the secondary bow, so that the dark band is seen between the bows.
    • This effect, called Alexander’s band, was first described by the Greek philosopher Alexander of Aphrodisias in the 3rd century.
  • The sky below the primary (lower) rainbow, and above the secondary (higher) bow, is brighter as a result.
slide16
Terms You Need to UnderstandVocab Assignment:1) “Working Definition”2) Illustration3) Use the word in a sentence
  • Absorption
  • Reflection
  • Dispersion
  • Incandescence
  • Luminescence
  • Diffraction
  • Scattering
  • Refraction
  • Interference