Question

State new cartesian sign conventions of mirrors.spherical

Answer 1

The new Cartesian sign conventions for spherical mirrors are :-
1. All the distances are measured from the pole of the mirror.
2. The distances measured in the direction of the incidents light are taken as positive while those measured in the direction opposite to the incidents light are taken as negative.
3. Heights or distances measured upward and perpendicular to the principal axis are considered positive while those measured downwards are considered negative.

NOTE:- According to this sign conventions, the focal length (f) and radius of curvature (R) are negative for a concave mirror and positive for a convex mirror.