Write the rules for sign convention.

Hint: We all know there are two types of mirror – Concave and Convex mirror. To answer this question we have to understand the position of object and image.

Complete step-by-step solution:
Lets see the rule for sign convention:
 All distance ought to be measured from the pole.
Distances measured within the direction of incident light to be taken \[\left( + \right)ve\] and measured in the backward direction of incident light to be taken \[\left( - \right)ve\].
Height of object and height of image measured upward and perpendicular to the principal axis are taken as \[\left( + \right)ve\]where those downwards measured are \[\left( - \right)ve\].
Clockwise angle measure with optic axis are \[\left( - \right)ve\]and anticlockwise measured as\[\left( + \right)ve\]


Note: The focal length and radius of curvature for concave mirror taken as\[\left( - \right)ve\] .Whereas , for convex mirror focal distance and radius of curvature are taken as \[\left( + \right)ve\].