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In the New Cartesian Sign Convention for spherical mirrors, distances measured along the principal axis are POSITIVE when:
AMeasured to the left of the pole
BMeasured above the principal axis only
CMeasured downward from the principal axis
DMeasured to the right of the pole
Answer & Solution
Correct answer: D. Measured to the right of the pole
Distances measured to the right of the pole (along +x) are positive; left of the pole are negative. Heights above the axis are positive; below are negative.
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