If `(1)/(f)=(1)/(u)+(1)/(v)`, then make v as the subject o the foormul – InterviewSolution

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1.	If `(1)/(f)=(1)/(u)+(1)/(v)`, then make v as the subject o the foormula. Also find v, if u=12 units and f=3 unitsA. 4 unitsB. `(1)/(9)` unitsC. 9 unitsD. `(1)/(4)` units
Answer» Correct Answer - A (i) Apply transposition. (ii) First of all bring `(1)/(v)` to LHS and `(1)/(f)` to RHS. (iii) Simplify the RHS. (iv) Then write the reciprocal form. (v) substitute the values of u and f.

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