Which of the following statement is true?

(a) A convex lens has 4D power having a focal length 0.25 m (b) A convex lens has 4D power having a focal length -0.25 m (c) A concave lens has 4D power having a focal length 0.25 m (d) A concave lens has 4D power having a focal length -0.25 m

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Anjali_20
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Saturday, 28 November 2020 10:14 AM
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