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When an object is placed 30 cm in front of a positive lens, the image distance is measured 81 cm. The focal length of this
When an object is placed 30 cm in front of a positive lens, the image distance is measured 81 cm. The focal length of this lens is __________ cm
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Principles of Economics
Authors: Fred M. Gottheil
7th edition
978-1133962069, 9781285064444, 1133962068, 1285064445, 978-1285064437
