According to Cartesian sign convention, in ray optics

Options

A. all distances in the direction of incident ray are taken positive
B. all distances are taken negative
C. all distances in the direction of incident ray are taken negative
D. all distances are taken positive

Answer

A

Explanation

According to Cartesian sign convention, the distances measured in the same direction as the incident light are taken as positive and those measured in the direction opposite to the direction of incident light are taken as negative.