Q. Define 1 dioptre of power of a lens.
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Answer:
1 dioptre of power of a lens is described as the unit of measurement of the optical power of a lens or 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 D.
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Since , power of a lens= 1/ focal length of lens
Thus , 1 diopter is defined as power of a lens whose focal length is 1 metre.
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