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Class 10 > Learn Class IX-X Tuition > Define power of a lens?
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Define power of a lens?

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Reciprocal of focal length and unit is diopter
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Power of a lens is the reciprocal of focal length and it unit is Dioptre(D)
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Physics Subject Expert

Power of a lens is reciprocal of its focal length measured in meter. Unit of power is Dioptre ( D) P=1/f (m)
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Concept Guru

tendency of a lens to converge or diverge the rays is known as power of lens. it can be obtained by taking reciprocal of the focal length of the lens. S.I unit = Dioptre or it can be denoted by D.
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Maths, programming language

Reciprocal of focal length
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Educationist.

The ability of a lens to converge or diverge the upcoming rays is called its power of lens. Also, mathematically it can be defined as the reciprocal of focal length of a lens. It's SI unit is Dioptre.
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Experienced Mathematics com ECE Educator

It is the reciprocal of focal length. P=1/f
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Tutor

and its unit is diopter
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Power of a lens, naturaly it defines as the area or lenght upto which we can see obects near or far away accordingly power of lens. Mathematically, we have a relation Power=1/focal lenght. Its just simple, defines resiprocal of focal lenght of lens.
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Tutor

It is equal to the reciprocal of the focal length of the device: P = 1/f. High optical power corresponds to short focal length. The SI unit for optical power is the inverse metre (m?1), which is commonly called the dioptre. Converging lenses have positive optical power, while diverging lenses have negative...
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It is equal to the reciprocal of the focal length of the device: P = 1/f. High optical power corresponds to short focal length. The SI unit for optical power is the inverse metre (m?1), which is commonly called the dioptre. Converging lenses have positive optical power, while diverging lenses have negative power. read less
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