Question

sign convention for spherical lenses

Answer 1

According to New Cartesian Sign Convection :
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 distance measured upward and perpendicular to the principal Axis are taken as positive
the distance is measured on what and perpendicular to the principal Axis are taken as negative

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Answer 2

HEYA MATE HERE U GO

. all distance are measured from the pole.

. distance measured along the direction of the light rays are taken as positive

distance measured opposite to the direction of the incident light rays are taken as negative

. the heights measured vertically above from the points on axis are taken as positive.

. the heights measured vertically down from the points on axis are taken as negative.

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