What do you mean by power of a lens?

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Solution

Power of a lens:
The measure of a lens to converge or diverge a ray of light after refraction is called the Power of the lens.
It is defined as the reciprocal of focal length.
$P o w e r = \frac{1}{f o c a l l e n g t h o f l e n s}$
The S.I unit of power of the lens is $d i o p t e r (D)$ .

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What do you mean by power of a lens?

Power of a lens:The measure of a lens to converge or diverge a ray of light after refraction is called the Power of the lens. It is defined as the reciprocal of focal length.Power=1focallengthoflensThe S.I unit of power of the lens is diopter(D).

Power of a lens:
The measure of a lens to converge or diverge a ray of light after refraction is called the Power of the lens.
It is defined as the reciprocal of focal length.
$P o w e r = \frac{1}{f o c a l l e n g t h o f l e n s}$
The S.I unit of power of the lens is $d i o p t e r (D)$ .