Sign convention — task. Physics CBSE Live product, Class 10 (2026-27).

Choose the correct answer:

A concave lens forms an image \(15\ cm\) in front of the lens. What is the sign of \(v\)?

\(v\) is negative, because image is formed on the same side as the object
\(v\) is positive, because image is always upright
\(v\) is zero, because image is at focus
\(v\) is positive, because image is real

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