An object is placed 10-cm from a converging lens.  An image 3x the size of the object is formed on the screen.  What is the focal length of the lens

Principles of Physics: A Calculus-Based Text
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ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
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Chapter26: Image Formation By Mirrors And Lenses
Section: Chapter Questions
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7. An object is placed 10-cm from a converging lens.  An image 3x the size of the object is formed on the screen.  What is the focal length of the lens?

   

7.5 cm

   

15 cm

   

25 cm

   

20 cm

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