# GIVEN: 1/f= 1/v + 1/u ;find v,if u=3f and f=10. ANSWER- 15

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Given: `(1/f) =(1/v+1/u)`

f=10 then u=3f=3*10=30

Now, plugging in the values of f and u in the above relation:

`1/10=1/v+1/30`

` rArr 1/v=1/10-1/30`

`rArr 1/v=2/30`

`rArr v=15`

**Therefore, the value of v is 15.**