A drop of water on a countertop reflects light from a flower held 3.0 cm directly above

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A drop of water on a countertop reflects light from a flower held 3.0 cm directly above it. The flower's diameter is 2.0 cm, and the diameter of the flower's image is 0.10 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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Physics

ISBN: 978-1118486894

10th edition

Authors: David Young, Shane Stadler

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