Science. A group of rays or a beam of radiation converging to or diverging from a point. Now rare or merged in sense 8(e).
| 单词 | θ76670 |
| 释义 | the world > matter > physics > electromagnetic radiation > light > [noun] > rays or waves > set of (5) pencil1665 Science. A group of rays or a beam of radiation converging to or diverging from a point. Now rare or merged in sense 8(e). optic pencil1704 the double cone of light rays that pass from an object point through the lens of the eye and are focused on the retina. cone of rays1706 Optics. a pencil of rays of light diverging from an illuminating point and falling upon a surface. sheaf1863 Physics and Mathematics. A bundle of rays, lines, etc. all passing through a given point. wave group1923 a short group of waves, not necessarily of uniform wavelength or amplitude. |
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