Question

1/u+1/v+1/f find the value of f when f=30 and u =20​

Answer 1

Answer:

I think the question will be - find the value of v when f=30 and u =20​  instead of  find the value of f when f=30 and u =20​

In that case v = 58.82

Step-by-step explanation:

1/u+1/v+1/f

or, 1/20 = 1/30 + 1/v

or, 1/20 - 1/30 = 1/v

or, 0.05 - 0.033 =  1/v

or, 0.017 =  1/v

or, v =  1/0.017 = 58.82

or, v =  58.82