Medium
Which of the following statements is true?
- A$A$ concave lens has $-4$ dioptre power having a focal length $0.25 \, m$.
- B$A$ convex lens has $-4$ dioptre power having a focal length $0.25 \, m$.
- C$A$ concave lens has $4$ dioptre power having a focal length $0.25 \, m$.
- D$A$ convex lens has $4$ dioptre power having a focal length $0.25 \, m$.
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