Question

what is
1 diopter and write its mathematical expression​

Answer 1

Answer:

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.) It is thus a unit of reciprocal length.

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Answer 2

Answer:

here you go:-

Explanation:

• it is usually referred to as lens power. Normally, the focal length of a lens uses millimeter as a unit such as 50mm, 100mm, 8.9mm and 71.mm. The lens power or diopter is defined as follows:
• That is, dividing 1000 by the focal length (in mm) of a lens yields the diopter of that lens. For example, a lens of 50mm has a diopter of 1000/50 = 20, and a lens of 8.9mm has a diopter of 1000/8.9 = 112.4. Since the diopter d of a lens is usually written as +d, 50mm and 8.9mm lenses have diopters +20 and +112.4, respectively