The sign conventions are as follows: -
● The object is placed always to the left of the mirror. This implies that the light from the object falls on the mirror from the left-hand side.
● All the distances parallel to the principal axis are measured from the pole of the mirror.
● All the distances measured to the right of the origin (along with + ve x-axis) are taken as positive while those measured to the left of the origin (along -ve x-axis) are taken as negative
● Distance measured perpendicular along + ve y-axis is taken as positive while those measured along -ve y-axis is taken as negative.
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