A Lens of Focal Length 10 Cm Is Placed in Contact

question 10

Multiple Choice

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?

• A) -15 cm
• B) 6.0 cm
• C) 7.5 cm
• D) −5.0 cm
• E) 30 cm

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