Aiyya, in that sign convention, the minus sign comes when the image is virtual or the lens is concave — just remember "virtual is minus" like I tell my gym members "no pain, no gain." Actually, helping my son with this last night made me see it clearly: the formulas are strict, like a workout plan. But in real life, whether it's a lens or my old gym equipment, the real value is in what it helps you see or become, not just the signs.
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