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Optics question. Given Diameter and object distance find image distance.

  1. Oct 6, 2011 #1
    An object is 9.79 cm from the surface of a reflective spherical Christmas-tree ornament 8.96 cm in diameter.
    What is the position of the image? Answer in units of cm

    I know that i need the radius of curvature to find the position of the image, but I'm not sure how to get that from the diameter? I tried just dividing by 2, but it says it is wrong. I just need help on finding the radius of curvature please, thanks!
  2. jcsd
  3. Oct 7, 2011 #2
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