Question

What is the Cartesian sign convention used for spherical
mirrors?​

Answer 1

Explanation:

Sign is taken as – (negative) from pole of a spherical mirror towards object along the principal axis. This means sign is always taken as – (negative) in front of a spherical mirror.

Answer 2

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For Spherical Mirror Left side is -ve, right side is +ve.

Up is +ve and down is taken -ve.

It is just like Cartesian Plane.