Sign convention for lens:
Sign convention for lens is similar to that of spherical mirror. Signs are taken left of the optical centre as negative, right of the optical centre as positive, above of the principal axis as positive and below of the principal axis as negative.
The new sign convention is known as New Cartesian Sign Convention. In this sign is taken negative towards left and taken as positive towards right at X-axis from origin.
The sign is taken as positive (+) above the origin point at Y-axis; and below the origin point as negative (-) at Y-axis.
Shaalaa.com | Light Reflection and Refraction part 17 (Sing conventions & lens formula)
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