Question

sign convention of lenses.

Answer 1

1. the height above principle axis will be positive and and height below principle axis is negative.
2. position of the image and object on left side of the lens is negative and the position of the image and object on right side of the lens is positive.

Answer 2

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. all the distances are measured from the pole.

. distances measured along the direction of the incident 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