Question

which sign convensions used in a spherical mirror ?

Answer 1

Hey mate here is your answer:--

Cartesian sign convension:-In the case of spherical mirror all signs are taken from pole to spherical mirror, which often called as origin point.This sign convention is known as CARTESIAN SIGN CONVENTION.

==>It will be positive behind the spherical mirror.
==>Height is taken as positive above the pricipal axis and taken as negative below the principal axis.

Hope this helps you.