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1.In sigh convention always object /image distance should b measured from pole irrespective of concave /convex.
2.when object/image distance is from right(⇒) then distance is +ve
3.when image/object distance  is from left opp. 2 the upper case then -ve
4.when image is below principle axis then -ve
5.if object is above principle axis it is +ve
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