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Define power....

Define power.

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(i) Ability of a lens to converge (convex lens) or diverge (concave lens) is called as its power.
(ii) The power of a lens can be defined as the degree of convergence or divergence of light rays.
(iii) Power of a lens is numerically defined as the reciprocal of its focal length .
`P=(1)/(f)`
The SI unit of power of a lens is dioptre.
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