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make7upurs make7upurs
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2 months ago

A lens of focal length 10 cm is placed in contact with a lens of focal length −15 cm. What is the focal length of the combination?



–15 cm



6.0 cm



7.5 cm



−5.0 cm



30 cm

Textbook 
College Physics

College Physics


Edition: 5th
Author:
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JehanzaibJehanzaib
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