Solve the Problem $\mathrm { f } = \frac { \mathrm { ab } } { \mathrm { b } + \mathrm { a } }$

question 266

Multiple Choice

Solve the problem.
-A formula for the focal length of a lens is $\mathrm { f } = \frac { \mathrm { ab } } { \mathrm { b } + \mathrm { a } }$ . Calculate $\mathrm { f }$ (the focal length) for $a = 10 \mathrm {~cm}$ and $\mathrm { b } = 6 \mathrm {~cm}$ . Round to the nearest tenth.

• A) \(3.8 \mathrm {~cm}\)
• B) \(3.0 \mathrm {~cm}\)
• C) \(6.3 \mathrm {~cm}\)
• D) \(5.0 \mathrm {~cm}\)

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