When the image distance be + or – in the case of cancave mirror and convex lens
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If an image is formed behind a concave mirror (to the right side) , the image distance is positive but if the image is formed in front of the mirror (on the left side) , then the image distance will be negative…
In a convex mirror, the image is always formed on a right hand side(behind the mirror) , so the image distance for a convex mirror will be always positive…