Question

what is power of lens and it's si unit​

Answer 1

Answer:

If a lens has a shorter focal length it is said to be more powerful. The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D).dioptre

A dioptre (British spelling) or diopter (American spelling) is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres. (1 dioptre = 1 m−1.)

Explanation:

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Answer 2

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✍Power of a lens is the ability to converge or diverge the ray of light falling on it. Power of alens is defined as reciprocal of focal length of thelens. A lens of small focal length has large powerof converging or diverging a parallel beam of light.dioptreis a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres. (1dioptre = 1 m−1.) It is thus a unit of reciprocal length.

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