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Which of the following statements is/are true? (a) A convex lens has 4 dioptre power having a focal length 0.25 m (b) A convex

Which of the following statements is/are true? (a) A convex 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 concave lens has - 4 dioptre having a focal length 0.25 m

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