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Question
Describe the New Cartesian Sigh Convention used in optics. Draw a labelled diagram to illustrate this sign convention.
Solution
According to the new cartesian sign convention :
- All distances are measured from the 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.
- Distances measured downward and perpendicular to the principal axis are taken as negative.
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