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

Select the best answer:

Which of the following statement is true?

A convex lens has \(4\ dioptre\) power having a focal length \(0.25\ m\)
A concave lens has \(-4\ dioptre\) power having a focal length \(0.25\ m\)
A convex lens has \(-4\ dioptre\) power having a focal length \(0.25\ m\)
A concave lens has \(4\ dioptre\) power having a focal length \(0.25\ m\)

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