I have not previously heard this term, but focal is the adjective of the word focus, so I would guess it is a question which focuses directly on the point of the matter.
The distance from a lens to the focal point is called the focal length.
The distance from the center of a mirror to the focal point is called the focal length.
The distance from the center of a mirror to the focal point is called the focal length.
The term that defines the distance from the focal point to either a lens or a mirror is called the focal length.
The near and far focal points refer to distances at which light rays are brought into focus by a lens or mirror. The near focal point is where light rays converge when the object is closer than the focal length. The far focal point is where light rays converge when the object is beyond the focal length.
It does not. For an explanation of "focal plane" see the question What is the focal plane?
"cén focal atá i gceist" means "which word is in question"
a camera? Or an eye? Something like that. Weird question
The Center of curvature is 2 times the focal length. By the way this is a physics question.
The focal ratio ( 'f' number ) is the ratio of focal length to diameter. For the numbers given in the question, assuming they're both in the same unit, this telescope is a 25/5 = f/5.
It does not. For an explanation of "focal plane" see the question What is the focal plane?
The longer the focal length the greater the zoom or magnification. If this was not your question go to the discussion page and elaborate. If you can't find the discussion page elaborate here.
The distance from a lens to the focal point is called the focal length.
focal length of the lens
Focal Point:The distance from the Lens to the Focal Point is called the Focal Point.
focal calcification
Focal Press was created in 1938.