Question

As per New Cartesian Sign Convention:​

Answer 1

Answer:

Cartesian Sign Convention: In the case of spherical mirror all signs are taken from Pole of the spherical mirror, which is often called origin or origin point. This sign convention is known as New Cartesian Sign Convention.

Answer 2

All distances are measured from the optical centre of the lens.

Distances measured in the direction opposite to the direction of incident light are considered negative.

Distances measured in the same direction as the incident light are considered positive.

Heights measured upwards and perpendicular to the principal axis are considered positive.

Heights measured downwards and perpendicular to the principal axis are considered negative.