define sign convention rule
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In physics, a sign convention is a choice of the physical significance of signs (plus or minus) for a set of quantities, in a case where the choice of sign is arbitrary. Sometimes, the term "sign convention" is used more broadly to include factors of i and 2π, rather than just choices of sign.
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the sign covention rule states the in the optics or in distance is always in the left hand side of the lens or mirror i.e., to -X side. ... For focal length, f in lens is always taken as negative for concave and positive for convex.
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