Under which of the following conditions will a convex mirror of focal length \( f \) produce an ...

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Under which of the following conditions will a convex mirror of focal length \( f \) produce an image that is erect, diminished and virtual?
(A) Only when \( 2 fuf \)
(B) Only when \( uf \)
(C) Only when \( u=f \)
(D) Always
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