Liner magnification of a concave lens is always positive, but for convex lena, it may be positive or negative.why?

Liner magnification of a concave lens is always positive, but for conv

1.	Liner magnification of a concave lens is always positive, but for convex lena, it may be positive or negative.why?
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Liner magnification of a concave lens is always positive, but for convex lena, it may be positive or negative.why?

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