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why a concave lens is called a converging or negative lens?

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter2: Geometric Optics And Image Formation

Section: Chapter Questions

Problem 9CQ: Under what circumstances will an image be located at the focal point of a spherical lens or mirror?

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