Define 1dioptre of power of a lens?

1.	Define 1dioptre of power of a lens?
Answer» Whose focal length is 1m Answer:1 dioptre of power of a lens is described as the unit of measurement of the\xa0optical power of a lens\xa0or curved mirror equivalent to the reciprocal of focal length (f). Measurement of the focal length in a meter.The SI unit of power of lens is dioptre whose focal length is one meter, which is denoted by the letter\xa0D.1 dioptre (D) = P = 1/fWhere f = focal le 1 dioptre is power of lens whose focal length (f) is 1m

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