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The SI unit of power is ___________.
The SI unit of power is dioptre.
Explanation
The power of a lens is defined as, the ability of a lens to bend the light falling on it.
Mathematically it is given as:-
$Power(dioptre)=\frac{1}{focal\ length\ (in\ meters)}$
The S.I unit of power of lens is ${m}^{-1}$, also known as dioptre (D).
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