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Understanding Wave Effects of Light: Huygens' Principle & Interference Patterns

Learn about wave effects of light, Huygens' Principle, interference patterns, and constructive vs. destructive interference. Explore the concept using simulations and examples. Study dispersion, angular diameter, and rainbows in this comprehensive guide.

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Understanding Wave Effects of Light: Huygens' Principle & Interference Patterns

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  1. OUR FINAL (EXAM III) Wednesday May 7 at 10:30 AM

  2. Wave effects of light

  3. Wave effects of light

  4. Wave effects of light Sharp spot Screen view

  5. Wave effects of light Fuzzy spot Screen view

  6. Wave effects of light bizarre spot

  7. Can analyze wave effects using Huygens’ Principle Huygens' construction Each point on the line (wave front) acts like a little oscillator making spherical waves Add up the contributions from all these little waves at the point of interest

  8. Two Slits – simplest case Huygens says

  9. Freeze time: crests and troughs

  10. Freeze time: crests and troughs +1 +1 -1 Wave sim http://phet.colorado.edu/en/simulation/wave-interference

  11. Destructive interference

  12. Constructive interference

  13. Constructive interference: in general Need:

  14. Constructive interference: in general

  15. Constructive interference: in general Equilateral triangle

  16. Constructive interference: Far Away

  17. Constructive interference: Far Away

  18. Condition for constructive interference: Condition for destructive interference:

  19. Example: Red light (630 nm) illuminates two slits 0.006 mm apart. At what angles will we see bright spots?

  20. Dispersion

  21. Larger n Smaller n

  22. Rainbow (Primary)

  23. Angular diameter

  24. Rainbow (Secondary)

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