Focal in a sentence

Because the magnification of a telescope is equal to the focal length of the objective divided by the focal length of the eyepiece, smaller focal-length eyepieces cause greater magnification.

Lenses are characterized by their focal length : a converging lens has positive focal length, while a diverging lens has negative focal length.

The objective focuses an image of a distant object at its focal point which is adjusted to be at the focal point of an eyepiece of a much smaller focal length.

He’s becoming a focal point in the Seahawks red zone offense and should be a focal point of your fantasy roster as well.

Close-up When the subject distance approaches the lens focal length, the focal length no longer is negligible, and the approximate formulas (11),(12) above cannot be used without introducing significant error.

For a background detail, the blur increases with focal length; for a foreground detail, the blur decreases with focal length.

For example, it is possible, with one thick lens in air, to achromatize the position of a focal plane of the magnitude of the focal length.

Longer focal length lenses will pass less light through the same aperture diameter due to the greater distance the light has to travel; shorter focal length lenses will transmit more light through the same diameter of aperture.

Researchers attributed this to focal colors having higher codability than less focal colors, and not with linguistic relativity effects.

The distance from this point to the lens is also known as the focal length, though it is negative with respect to the focal length of a converging lens.

The effective aperture is expressed by an f-number or f-stop (derived from focal ratio ), which is proportional to the ratio of the focal length to the diameter of the aperture.

The focal ratio (f-number, the ratio of the focal length to the dish diameter) of typical parabolic antennas is 0.25 - 0.8, compared to 3 - 8 for parabolic mirrors used in optical systems such as telescopes.

The light is not focused to a point but forms an Airy disk having a central spot in the focal plane with radius to first null of : where λ is the wavelength of the light and N is the f-number (focal length divided by diameter) of the imaging optics.

The objective lens is essentially a magnifying glass and was designed with a very small focal length while the eyepiece generally has a longer focal length.

The plate scale is the reciprocal of the focal length of the camera lens; lenses are categorized as long-focus lenses or wide-angle lenses according to their focal lengths.

Al-Shifa hospital has been the focal point of days of fighting and nearby aerial bombardments in Israel's war with Hamas.

Also, at the forum, the Attorney-General and Minister of Justice, Abubakar Malami, the growth and development of the economy has been one of the major focal points of this administration’s policy directives.

And during the 10 week run of Banksy's Cut & Run exhibition the cone and the Duke have been a focal point.

And in this focal point itself, the rules of time and space cease to exist.

As the legal proceedings against former President Donald Trump gain momentum in Washington, D.C., the question of securing an impartial jury has become a focal point of discussion.