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What are the three situations in which light does not travel in a straight line?

  1. Aug 1, 2012 #1
    what are the three situations in which light does not travel in a straight line?
    I know two situations; Superposition and Spectrum.
    What is the last situation??

    Is that Wavelength?
     
  2. jcsd
  3. Aug 1, 2012 #2

    NascentOxygen

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    Staff: Mentor

    Is refraction another?
     
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