A convex lens with 1 = 20.0 cm is mounted 40.0 cm to the left of a

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A convex lens with ƒ1 = 20.0 cm is mounted 40.0 cm to the left of a concave lens. When an object is placed 30.0 cm to the left of the convex lens, a real image is formed 60.0 cm to the right of the concave lens. What is the focal length ƒ2 of the concave lens?
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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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