Can magnification be negative for a convex mirror? If not, why?
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According to the new Cartesian sign conventions, magnification for a convex mirror is positive because image formed by a convex mirror is always virtual and erect. ... In the latter case, its magnification becomes negative. The reason though correct does not explain the assertion properly.
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A convex mirror would always produce an erect image, and a concave mirror may produce an inverted or an erect image depending on the position of the object placed.
Thus, independent of the sign convention, the magnification of a convex mirror is always positive, but that of a concave mirror may be both positive or negative.
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