For what refractive index would the focal length of a planoconvex lens be equal to the curvature

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For what refractive index would the focal length of a planoconvex lens be equal to the curvature radius of its one curved surface?

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Related Book For  answer-question

Essential University Physics

ISBN: 978-0321976420

3rd Edition Volume 2

Authors: Richard Wolfsonby

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