Path: Imaging/Optics
% Computes the output angle from a Cooke Triplet.
 You select the focal lengths of the 3 lenses and
 the position of lens 2. 
 Lens 1     Lens 2    Lens 3
      |          |         |
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   Form:
   theta = CookeTriplet( x, d )
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   Inputs
   ------
   x               (1,1) The delta position of L3
   d               (1,1) Data structure
                         .f (1,3) Focal lengths
                         .x (1,3) Initial locations
                         .y (1,1) Initial ray
   -------
   Outputs
   -------
   theta           (1,1) Output  angle from triplet
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Imaging: Optics/RayTransferMatrix
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