Explain the new Cartesian sign convention.

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.