Sign conventions for lens

1.	Sign conventions for lens
Answer» 1 object is always at left side of pole2 all distance parallel to principal axis are from Pole 3 all distances right side of origin are positive While measured to left side of origin are negative4. Distance measured perpendicular to and Above principal axis are positive 5. Distance measured perpendicular to and below principal axis are negative6. Focal length of convex mirror is positive while concave mirror is negative

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