How should I use slow cross fast rule?

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Homework Statement



http://i.imgur.com/a36Mj.png
Diagram of a quarter-wave plate with an incoming linearly polarized wave hitting it at an angle; x axis labelled slow axis, y axis labelled fast axis, with the z direction shown. Question text lists equation E(x,t) = (x̂ - ŷ)/√2 E0 cos(kz - ωt) and choices for emerging light.



Homework Equations





The Attempt at a Solution



Slow cross fast gives me positive z direction...
 
Attachments
  • Diagram of a quarter-wave plate with an incoming linearly polarized wave, labeled x (slow axis) and y (fast axis), and the wave propagating along z; the problem text beside it gives the field E = (x-hat minus y-hat)/sqrt(2) E0 cos(kz - wt) and three answer choices.
    11.png
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