A Cup That Is $6.0 \mathrm {~cm}$ Tall Is in Front of a Concave Lens

question 99

Multiple Choice

A cup that is $6.0 \mathrm {~cm}$ tall is in front of a concave lens. The image of the cup is $2.5 \mathrm {~cm}$ tall and $7.5 \mathrm {~cm}$ from the lens. What is the focal length of the lens?

• A) \(- 13 \mathrm {~cm}\)
• B) \(+ 6.0 \mathrm {~cm}\)
• C) \(+ 18 \mathrm {~cm}\)
• D) \(- 6.0 \mathrm {~cm}\)
• E) \(- 7.5 \mathrm {~cm}\)

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