According to the Cartesian sign convention for mirrors, which statement is correct for an object placed in front of a mirror on the left side when incident light travels from left to right? 
ADistances measured to the left of the pole are positive, and heights measured downward are positive.
BDistances measured in the direction of incident light are positive, and heights measured upward from the principal axis are positive.
CAll distances measured from the pole are negative, while all heights are positive.
DDistances measured opposite to incident light are positive, and heights are always negative.
Answer & Solution
Correct answer: B. Distances measured in the direction of incident light are positive, and heights measured upward from the principal axis are positive.
In the Cartesian sign convention, all distances are measured from the pole. Distances measured in the same direction as the incident light are taken as positive, and those opposite to it are negative. Heights above the principal axis are positive, while heights below it are negative.
Related questions
In a compound microscope, the lens placed near the object has which property compared withFor correcting myopia, a concave lens is used. According to the convention for lens power,The ability of the eye lens to focus on both nearby and distant objects by changing its foFor a hypermetropic person, the near point has shifted to 1.5 m. Using $f = \dfrac{dD}{d-DA myopic person can clearly see objects only up to 4 m and wants to see objects up to 20 mThe eye defect presbyopia, in which a person loses the power of accommodation for both neaIn a myopic (short-sighted) eye, where is the image of a distant object formed relative toTwo thin lenses of powers $+5\ \text{D}$ and $-2\ \text{D}$ are placed in contact. What is