State and explain the New Cartesian Sign Convention for spherical lenses.
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New Cartesian Sign Convention for spherical lenses:
- All the distances are measured from the optical centre of the lens.
- The distances measured in the same direction as that of incident light are taken as positive.
- The distances measured against the direction of incident light are taken as negative.
- The distances measured upward and perpendicular to the principal axis are taken as positive.
- The distances measured downward and perpendicular to the principal axis are taken as negative.
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