Question

If $\frac{1}{f}=\frac{1}{u}+\frac{1}{v}$, then make $v$ as the subject of the formula.

• A. $v=\frac{u-f}{uf}$
• B. $v=\frac{f-u}{fu}$
• C. $v=\frac{uf}{u-f}$
• D. $v=\frac{uf}{u+f}$

Answer 1

Answer: (C)

(i) Apply transposition.
(ii) First make $\frac{1}{v}$ as the subject and then write reciprocal form.