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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