.Which of the following statements is tr...

.Which of the following statements is true? (a) A convex lens has 4 dioptre power having focal length 0.25 m (b) A convex lens has -4 dioptre power having focal length 0.25 m (c) A concave lens has 4 dioptre power having focal length 0.25 m (d) A concave lens has -4 dioptre power having focal length 0.25 m

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