Question

According to Cartesian sign convention, all distances are measured from the _______.

Options

• infinity

• bottom of the mirror or the lens

• pole of the mirror or the optical centre of the lens

• top of the mirror or the lens

Answer 1

According to Cartesian sign convention, all distances are measured from the pole of the mirror or the optical centre of the lens.

Explanation:

All distances (object distance, image distance, focal length, radius of curvature) are measured from the pole of the mirror/optical centre of the lens, according to New Cartesian sign norms.