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[[Image:lighterstill.jpg]]
[[Image:lighterstill.jpg]]
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.