sign convention of concave and convex mirror in points and also concave lens , convex lens
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●Imagine that you take a mirror or lens and place the pole on the (0,0) point 《THE POINT WHERE X AND Y AXES INTERSECT》 on a cartesian plane 《GRAPH SHEET》.
●RIGHT SIDE FROM POLE AND UPWARDS FROM PRINCIPAL AXIS: +ve
●LEFT SIDE FROM POLE AND DOWNWARDS FROM THE PRINCIPAL AXIS: -ve
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