How is the object distance measured in the sign convention for spherical lenses?
It is measured from the optical center towards the position of the object.
Under the New Cartesian sign convention for spherical lenses, all distances are measured from the optical centre of the lens.
The object distance (u) is measured from the optical centre to the position of the object.
Hence, the answer is that it is measured from the optical center towards the position of the object.
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