Modifies a noun

• point: The exhibit had at its center a tall focal point, in the shape of a large spiral.

• length: A convex lens has a focal length of 150 mm.

• plane: A cross can be seen in the back focal plane.

• reducer: I use both the 6.3 and 3.3 focal reducers from Meade witout focus problems.

• adhesion: The first system is the study of protein modules which mediate transient associations at sites of focal adhesion.

• lesion: Affected fish may have focal red lesions on their body.

Modifying Another Word

• back: A cross can be seen in the back focal plane.

• long: US Army photographs a UFO near a missile using a special, very long focal length telescope.

• also: Local centers are typically also focal points for the community life of their areas.

• only: This total includes all dyads in the group, not only focal females.