Question

Discuss
new
cartesian Sign convention

Give its
use.​

Answer 1

New Cartesian Sign Convention for spherical lenses:

(i) All the distances are measured from the optical centre of the lens.

(ii) The distances measured in the same direction as that of incident light are taken as positive.

(iii) The distances measured against the direction of incident light are taken as negative.

(iv) The distances measured upward and perpendicular to the principal axis are taken as positive.

(v) The distances measured downward and perpendicular to the principal axis are taken as negative