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Power of a lens is -2.5 D. What is the f...

Power of a lens is -2.5 D. What is the focal length and nature of the lens.

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`P =-2.5`
`f = (1)/(P) = - (1)/(2.5) =- 0. 4 m - 40 cm`
`therefore ` The lens is a concave lens with focal length 40 cm.
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