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For other uses, see Diopter (disambiguation). A dioptre (uk), or diopter (us), 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 (that is, 1/metres). It is thus a unit of reciprocal length. For example, a 3-dioptre lens brings parallel rays of light to focus at 1â3 metre.
Lens collects and focuses light from the lamp onto the specimen on  the slide is the condenser lens. A diaphragm is used to regulate  light passing through this lens is the â¦ condenser. Answered. In Microbiology.