While proving mirror formula,

How will fv/uvf = uv-uf/uvf become 1/v+1/u=1/f in the next/step.

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Solution

fv/uvf + uf/uvf - uv/uvf=0

Dear student divide each one by one like in fv/uvf then upper fv is cut out by lower fv and only u left so it become 1/u
similarly all three was done.. and give you the next line

1/u +1/v - 1/f=0

1/u + 1/v = 1/f

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