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Sign convention for distances in a lens experiment takes:
AAll distances above axis as negative in standard practice
BDistances measured against the incident-ray direction as negative
CAll distances to the right as negative
DAll distances behind the lens as positive
Answer & Solution
Correct answer: B. Distances measured against the incident-ray direction as negative
1. The convention is the Cartesian sign convention.
2. The optical centre is the origin; the principal axis is the x-axis.
3. Distances measured along the incident ray are positive.
4. Distances measured against the incident ray are negative.
5. So object distance u of an object on the left of the lens is negative.
_Source: Selina Concise Physics ICSE Class 10, Ch 5 'Refraction through a Lens' (aplustopper.com extract)_
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