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# Write the rules for sign convention. Verified
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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 $\left( + \right)ve$.