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Define power of a lens and write its uni...

Define power of a lens and write its unit

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Power of a lens : Power of a lens is defined as its bending ability and is measured as reciprocal of focal length in metre.
`therefore" Power of a lens (P)"=(1)/("f (in metres)")=(100)/("f(in cms)")`
`"Unit" rarr "Dioptre (D)"`
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