Herzberger, Max J. Formerly, Department of Physics, Louisiana State University, Baton Rouge, Louisiana.
- Additional Readings
A measure of the power of a lens or a prism. The diopter (also called dioptrie) is usually abbreviated D. Its dimension is a reciprocal length, and its unit is the reciprocal of 1 m (39.4 in.). Thus a thin lens of κ diopters has a focal length of mm or in. The lens is collecting for positive κ, diverging for negative κ, and afocal for κ = 0. See also: Focal length; Lens (optics)
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