If `f=3cm` and v=4 cm, then find u. – InterviewSolution

InterviewSolution

1.	If `f=3cm` and v=4 cm, then find u.
Answer» `(1)/(f)=(1)/(u)+(1)/(v)rArru=(fv)/(v-f)` `=(3xx4)/(4-3)=12cm`.

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