Solve $\frac { 1 } { f } = \frac { 1 } { s _ { 1 } } + \frac { 1 } { s _ { 2 } }$

question 267

Multiple Choice

Solve: $\frac { 1 } { f } = \frac { 1 } { s _ { 1 } } + \frac { 1 } { s _ { 2 } }$ for $f$

• A) \(f = \frac { s _ { 1 } s _ { 2 } } { s _ { 1 } + s _ { 2 } }\)
• B) \(f = + 1\)
• C) \(f = s _ { 1 } + s _ { 2 }\)
• D) \(f = \frac { s _ { 1 } s _ { 2 } } { s _ { 1 } - s _ { 2 } }\)

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