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Effective ways of altering the speed of EMR

  1. Feb 25, 2009 #1
    What are the ways in which the speed of Electromagnetic radiation can be effectively changed from point A to point B? (no relativistic motion) So far i have (i think):

    !) Altering the direction
    Light bouncing down a tunnel of mirrors

    2) Altering the medium which it is travelling through

    Does anyone know of any other ways? I am not sure of the effect of the space-time continuum on it; does it only change its direction temporarily? Can it be put back on the same course with multiple gravitational sources? Also will either of these change the wavelength?

    Thanks! :)
    Last edited: Feb 25, 2009
  2. jcsd
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