Units of length

Optical unit

Optical units are dimensionless units of length used in optical microscopy. They are used to express distances in terms of the numerical aperture of the system and the wavelength of the light used for observation. Using these units allows comparison of the properties of different microscopes. For example, the diameter of the first minimum of the Airy disk is always 7.6 optical units in the image plane of a diffraction limited microscope. (Wikipedia).

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From playlist Physics - Light and Optics

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From playlist Physics - Light and Optics

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From playlist MIT 6.003 Signals and Systems, Fall 2011

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Related pages

Numerical aperture | Wavelength