Use the Formula $\frac { 1 } { f } = \frac { 1 } { s _ { 0 } } + \frac { 1 } { s _ { i } }$

question 59

Multiple Choice

Use the formula $\frac { 1 } { f } = \frac { 1 } { s _ { 0 } } + \frac { 1 } { s _ { i } }$ . Given $s _ { 0 } = 6$ cm and $s _ { i } = 12$ cm, find $f$ .

• A) \(f = 18 \mathrm {~cm}\)
• B) \(f = 3 \mathrm {~cm}\)
• C) \(f = 7 \mathrm {~cm}\)
• D) \(f = 2 \mathrm {~cm}\)
• E) \(f = 4 \mathrm {~cm}\)

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