Elliptical Concave Mirror

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Find the focal length of a concave mirror made from a small section cut out from near the vertex of an ellipsoidal reflecting surface symmetrically about its major axis.


  • Ellipsoid is made by rotating the ellipse \(\frac{x^2}{16}+\frac{y^2}{8} =1\) about its major axis.
  • Rays incident on this mirror can be considered paraxial to the major axis

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