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What is power of lens ?What are its unit...

What is power of lens ?What are its units?

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The degree of convergence or divergence of light rays that can be achieved by lens is expressed in terms of its power.
The reciprocal of focal length is called power of lens.
Power of lens `P=(1)/(f("in m"))` (or) `P=(100)/(f("in cm"))`
The unit of power of lens is dioptre , denoted by 'D'.
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