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Homework Help: Reflection in an elipse

  1. Aug 21, 2015 #1
    I needed the proof of this:if a ray of light passes from one focus of an elipse after reflection it will pass the other focus.please i need the one only using the fact that i=r ( not the fermat rule)
  2. jcsd
  3. Aug 21, 2015 #2


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    Homework Helper

    In reference to the attached image, what do you know about length of segment d2 compared to the distance 2*c between the foci?
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