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

AI Thread Summary
To find the image distance for a reflective spherical ornament, the radius of curvature is essential and can be calculated from the diameter. The radius of curvature is half the diameter, so for an 8.96 cm diameter, it should be 4.48 cm. However, the user encountered issues with this calculation, indicating a possible misunderstanding of the formula or context. The discussion highlights the importance of correctly applying the radius of curvature in optics problems. Clarification on the formula used for image distance could further assist in resolving the confusion.
mfreeman91
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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!
 
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