Describe the New Cartesian Sign Convention used in optics. Draw a labelled diagram to illustrate this sign convention.
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According to the New Cartesian Sign Convention:
- All the distances are measured from pole of the mirror as origin.
- Distances measured in the same direction as that of incident light are taken as positive.
- Distances measured against the direction of incident light are taken as negative.
- Distances measured upward and perpendicular to the principal axis are taken as positive.
- Distance measured downward and perpendicular to the principal axis are taken as negative.
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