A converging lens is placed 30.0 cm to the right of a diverginglens of focal length 10.0 cm. A beam of parallel light entersthe diverging lens from the left, and the beam is again parallelwhen it emerges from the converging lens. Calculate the focallength of the converging lens.

University Physics Volume 3
17th Edition
ISBN:9781938168185
Author:William Moebs, Jeff Sanny
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Chapter2: Geometric Optics And Image Formation
Section: Chapter Questions
Problem 63P: Au object of height 3.0 cm is placed at 25 cm in front of a diverging lens of focal length 20 cm....
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A converging lens is placed 30.0 cm to the right of a diverging
lens of focal length 10.0 cm. A beam of parallel light enters
the diverging lens from the left, and the beam is again parallel
when it emerges from the converging lens. Calculate the focal
length of the converging lens.

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