Write the sign conventions for spherical mirrors.

Explanation

Sign conventions for spherical mirrors.
(i) All the distances are measured from the 'P' (pole) of the mirror.
(ii) Distances measured in the direction of incident ray are taken as positive.
(iii) Distances measured opposite to the direction of incident ray are taken as negative.
(iv) Distances measured perpendicular to and above the Principal axis are taken as positive.
(v) Distances measured perpendicular to and below Principal axis are taken as negative.