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The following sign convention is used for measuring various distances in the ray diagrams of spherical mirrors:
- Object is always placed to the left of mirror
- All distances are measured from the pole of the mirror.
- Distances measured in the direction of the incident ray are positive and the distances measured in the direction opposite to that of the incident rays are negative.
- Distances measured along y-axis above the principal axis are positive and that measured along y-axis below the principal axis are negative.
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