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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.

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

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  1. 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 !!

  2. Dispersion • The separation of light into colors arranged according to their frequency, by interaction with a prism or diffraction grating.

  3. 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

  4. 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)

  5. Volcanoes are a vivid example of incandescent molten rock

  6. 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.

  7. 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.

  8. What causes the color we see swirling about the surface of bubbles?

  9. 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

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