Easy
Define the term power of a lens.
(N/A) The power of a lens is defined as the ability of a lens to converge or diverge a beam of light falling on it. It is mathematically expressed as the reciprocal of its focal length in meters,given by the formula $P = 1/f$ (where $f$ is in meters). The $SI$ unit of power of a lens is Dioptre $(D)$.
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