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Explain power of the lens...

Explain power of the lens

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The focal length of a lens is f then its reciprocal (I/t) is called the power of the lens. So Power of the lens = p = 1/f. When f is measured in metres then power of the lens is in dioptres. the unit of power "dioptre" is defined as the power of a lens of focal-length one metre. Its symbol is .D..
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