Self-Reproducing Rays in a symmetric Resonator

tuanle007
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Homework Statement




Self-Reproducing Rays in a symmetric Resonator. Consider a symmetric resonator using two concave mirrors of radii R separated by a distance d=3|R|/2. After how many round trips through the resonator will a ray retrace its path?

Homework Equations





The Attempt at a Solution



i don't know where to start and equations to work with
 
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I'd start by looking up the focal length of a mirror of radius R.
 
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