| 单词 | zone plate |
| 释义 | > as lemmaszone plate zone plate n. a plate of glass marked out into concentric zones or rings alternately transparent and opaque, used like a lens to bring light to a focus. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > lens > [noun] > plate of glass used like a lens zone plate1890 1890 T. Preston Theory of Light ix. 178 A zone plate has therefore the power of a condensing lens. 1937 G. S. Monk Light xii. 167 The intensity of the image produced with a zone plate will be greater if alternate zones are not blocked out but are left transmitting, with a phase difference of one half period introduced between them and adjacent zones. 1978 Sci. Amer. Nov. 65/1 When the zone plate is illuminated with an X-ray plane wave, a converging spherical wave will come out. < as lemmas |
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