(i) All the distances along the principal axis (i.e., u, v and f) are measured with respect to pole of a mirror.
(ii) Measured in the direction of light ray are taken as positive and those measured opposite to the direction of light ray as negative.
(iii) The distances (heights) measured above the principal axis are taken as positive while distances below the principal axis are taken as negative
(iv) According to this sign convention, the focal length and radius of curvature of a concave mirror are negative, while those of convex mirror are positive.
(v) If the object is situated on left hand side (as it is so normally), the object distance u is always negative.
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