focal

1. a. Belonging to,or concerning, a focus; as, a focal point. Source: opted

2. adj. having or localized centrally at a focus Source: wordnet

3. adj. of or relating to a focus Source: wordnet

4. Belonging to,or concerning, a focus; as, a focal point. Focal distance, or length,of a lens or mirror (Opt.), the distance of the focus from the surface of the lens or mirror, or more exactly, in the case of a lens, from its optical center. --Focal distance of a telescope, the distance of the image of an object from the object glass. Source: webster

5. Belonging to,or concerning, a focus; as, a focal point. Focaldistance, or length,of a lens or mirror (Opt.), the distance of thefocus from the surface of the lens or mirror, or more exactly, in thecase of a lens, from its optical center. --Focal distance of atelescope, the distance of the image of an object from the objectglass. Source: adambom

6. j:100 s. having or localized centrally at a focus a. of or relating to a focus Source: ecdict

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