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Rotating mirrors

  1. Dec 4, 2007 #1
    Question
    there are two discs rotating with angular speed [tex]\omega[/tex] in oppsite direction.Both of them have some number of mirrors attached to them in such a way that a light ray coming from a source kept in between them gets reflected n times at each mirror in one second .Find the angular speed [tex]\Omega[/tex]
    of such a ray.

    Relevant Theory
    if the mirror rotates by an angle [tex]\theta[/tex] and if the direction of incident ray is unchanged then the reflected ray turns an angle [tex]2\theta[/tex]

    Attempt
    i don't understand the meaning of [tex]\Omega[/tex] here in some sense.basically no idea
     
  2. jcsd
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