Question

2. Define 1 diopter power of a lens?
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Answer 1

Answer:

1 Dioptre power of lens is equal to the reciprocal of the Focal Length

1 D = 1/f

Answer 2

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Define 1 diopter power of a lens?

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A dioptre (British spelling) or diopter (American spelling) is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres. (1 dioptre = 1 m−1.)For example, a 3-dioptre lens brings parallel rays of light to focus at 1⁄3 metre.