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

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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.