Sign convention for lens — task. Physics CBSE Live product, Class 10 (2025-26).

Choose the best answer:

Which of the following statements is true?

A concave lens has \(6\ dioptre\) power having a focal length \(-0.17\ m\)
A concave lens has \(-6\ dioptre\) power having a focal length \(-0.17\ m\)
A convex lens has \(-6\ dioptre\) power having a focal length \(0.25\ m\)
A convex lens has \(6\ dioptre\) power having a focal length \(-0.25\ m\)

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