Optics. Of or relating to a focus of a lens, mirror, or other optical system (see focus, n. 5a); collected or situated at a focus of reflected or…
| 单词 | θ76219 |
| 释义 | the world > matter > physics > electromagnetic radiation > heat > [adjective] > radiation > focus (2) focal1794 Optics. Of or relating to a focus of a lens, mirror, or other optical system (see focus, n. 5a); collected or situated at a focus of reflected or… Subcategories:— not passing through (1) |
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