Question

What is the SI unit of power of a lens? Define it.
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Answer 1

Answer:

the ability of a lens to converge/diverge a beam of light rays is expressed in terms of its Power(P). P=1/f. The SI unit of power of lens is Dioptre.It is denoted by the letter "D" SI unit of length is metre(m) therefore.

Answer 2

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☯ Power of a lens :

A beam of light parallel to principal axis either gets converged ordiverged after refraction by a lens. Some lenses converge the beam of light to a small extent and some lenses converge it to a large extent. This ability of lens to converge or diverge a beam of light is known as the power of lens.

☯SI unit of power of lens is diopter :

☯One dioptre is the power of a lens whose focal length is 1 m.