NCERT Exemplar VII — task. Science CBSE, Class 10.

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Which of the following statements is true?

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

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