Diffraction And Interference

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Chapter 31 Hewitt Presentation

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Diffraction And Interference

  1. 1. Thin-Film Interference <ul><li>Requires the thickness of a very thin surface to vary from the top to the bottom. </li></ul><ul><li>When the light reflects off the front surface is a multiple of ¼ of the wavelength of the light reflecting of the back surface, the waves interfere to reinforce a specific color. </li></ul><ul><li>The colors change as the thickness of the film changes, and the ¼  is met at different locations for different colors. </li></ul>
  2. 2. Two-Slit Interference <ul><li>When light passes through two parallel slits, the light is diffracted, and spreads out. The spreading light resulting from each slit overlaps. A pattern of alternating bright and dark bands forms on an observing screen, resulting from constructive and destructive interference of light waves from the two slits. </li></ul>
  3. 3. Effects of Changing Wavelength and Source Distance
  4. 4. Effect of Wavelength on Interference Effects <ul><li>The nodal and anti-nodal lines spread farther apart as the wavelength gets larger </li></ul>
  5. 5. Effect of Distance On Interference Effects <ul><li>The nodal and anti-nodal lines spread farther apart as the sources come closer together. </li></ul>
  6. 6. Two-Slit Interference Pattern
  7. 7. Diffraction <ul><li>The bending of light around an obstacle or through a small opening. </li></ul><ul><li>Because wavelengths of light are so small, you usually don’t see light diffraction. The interference patterns are very small. </li></ul><ul><li>Diffraction grating – a piece of glass or plastic with thousands of parallel slits placed very close together. </li></ul>
  8. 8. Example of Diffraction

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