Posted by **Kristi** on Thursday, November 17, 2011 at 2:38pm.

A drop of water on a countertop reflects light from a flower held 2.8 cm directly above it. The flower's diameter is 1.7 cm, and the diameter of the flower's image is 0.17 cm. What is the focal length of the water drop, assuming that it may be treated as a convex spherical mirror?

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