Q.3: What is dioptre?
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A dioptre or diopter is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dioptre = 1 m⁻¹. It is normally used to express the optical power of a lens or curved mirror, which is a physical quantity equal to the reciprocal of the focal length, expressed in metres.
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Metre inverse is also called dioptre.
Used to express Power of Mirror or lens.
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