Question

Write the rules for sign convention.

Answer 1

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 $$(+)ve$$ and measured in the backward direction of incident light to be taken $$(-)ve$$.
Height of object and height of image measured upward and perpendicular to the principal axis are taken as $$(+)ve$$where those downwards measured are $$(-)ve$$.
Clockwise angle measure with optic axis are $$(-)ve$$and anticlockwise measured as$$(+)ve$$

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