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focal point▼((optics) a focus; a point at which rays of light or other radiation converge)noun[UK: ˈfəʊk.l̩ pɔɪnt] [US: ˈfoʊk.l̩ ˈpɔɪnt]
focus▼(in optics)noun[UK: ˈfəʊkəs] [US: ˈfoʊkəs]
focal length [focal lengths]▼(distance)noun[UK: ˈfəʊk.l̩ leŋθ] [US: ˈfoʊk.l̩ ˈleŋkθ]
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