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In the mirror formula, (1)/(f)=(1)/(v)+1...

In the mirror formula, `(1)/(f)=(1)/(v)+1/u,f` does not change when u is changed.

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The mirror formula is `(1)/(v) + 1/u =(1)/(f)`, where the symbols have standard meaning. When u is changed, v changes, but f remains constant. This is because focal length of mirror depends only on radius of curvature of the mirror.
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The mirror formula is given by 1/v+1/u=1/f where the symbols have their usual meanings. Then the lens formula is given by