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| 单词 | Fresnel lens |
| 释义 | fresnel /frāˈnəl/nounA unit of optical frequency, equal to 1012Hz (= 1 terahertz) ORIGIN: AJ Fresnel (1788–1827), French physicist Fresnel ellipsoid noun A method, used in crystal optics, of representing the doubly refracting properties of a crystal Fresnel lens noun (image technol) A lens having a surface of stepped concentric circles, thinner and flatter than a conventional lens of equivalent focal length Fresnel zones plural noun (physics) Zones into which a wavefront is divided according to the phase of the radiation reaching any point from it |
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