Difference between revisions of "Foci"
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− | [[Image:lighterstill.jpg]] | + | [[Image:lighterstill.jpg]][[Image:Foci.jpg|right|frame|<center>Formation of nuclear "foci"</center>]] |
− | Noun - focus, Plural - countable and uncountable; '''foci''' or focuses | + | Noun - [[focus]], Plural - countable and uncountable; '''foci''' or focuses |
*1. (countable) (optics) a point at which reflected or refracted rays of light converge. | *1. (countable) (optics) a point at which reflected or refracted rays of light converge. | ||
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*6. (countable) the exact point of where an earthquake occurs, in three dimensions. | *6. (countable) the exact point of where an earthquake occurs, in three dimensions. | ||
− | The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.[ | + | The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.[https://en.wiktionary.org/wiki/focus] |
[[Category: General Reference]] | [[Category: General Reference]] |
Latest revision as of 01:17, 13 December 2020
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Noun - focus, Plural - countable and uncountable; foci or focuses
- 1. (countable) (optics) a point at which reflected or refracted rays of light converge.
The heat of sunlight at the focus of a magnifying glass can easily set dry leaves on fire.
- 2. (countable) (geometry) a point of a conic at which rays reflected from a curve or surface converge.
- 3. (uncountable) (photography, cinematography) The fact of the convergence of light on the photographic medium.
Unfortunately, the license plate is out of focus in this image.
- 4. (uncountable) (photography, cinematography) The quality of the convergence of light on the photographic medium.
During this scene, the boy’s face shifts subtly from soft focus into sharp focus.
- 5. (uncountable) concentration of attention.
I believe I can bring the high degree of focus required for this important job.
- 6. (countable) the exact point of where an earthquake occurs, in three dimensions.
The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.[1]