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Power of a lens is the ___________ of its focal length.
Power of a lens is the reciprocal of its focal length.
Explanation
The power of a lens is defined as, the ability of a lens to bend the light falling on it.
A convex lens converges the light rays towards the principal axis while a concave lens diverges the light rays away from the principal axis.
Mathematically it is given as:-
$Power=\frac{1}{focal\ length\ (in\ meters)}$
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