A rare 1918 Jenny stamp, depicting a misprinted, upside-down Curtiss JN-4 Jenny airplane, sold at auction for

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A rare 1918 "Jenny" stamp, depicting a misprinted, upside-down Curtiss JN-4 "Jenny" airplane, sold at auction for $525,000. A collector uses a simple magnifying glass to examine the "Jenny," obtaining a linear magnification of 2.5 when the stamp is held 2.76 cm from the lens. What is the focal length of the magnifying glass?
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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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