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The New Cartesian Sign Convention takes distances measured against the direction of incident light as:
ANegative
BPositive
CZero
DUnitless
Answer & Solution
Correct answer: A. Negative
1. The convention places the object on the left of the mirror.
2. Light travels left to right; this is the positive direction along the principal axis.
3. Distances to the left of the pole (against light direction) are taken as negative.
_Source: NCERT Class 10 Science, Ch 9 "Light Reflection and Refraction", §9.2.3_
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