Focus (optics)

Eye focusing ideally collects all light rays from a point on an object into a corresponding point on the retina.

An image that is partially in focus, but mostly out of focus in varying degrees.

Focal blur is simulated in this computer generated image of glasses, which was rendered in POV-Ray.

In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle. This non-ideal focusing may be caused by aberrations of the imaging optics. In the absence of significant aberrations, the smallest possible blur circle is the Airy disc, which is caused by diffraction from the optical system's aperture. Aberrations tend to get worse as the aperture diameter increases, while the Airy circle is smallest for large apertures.

单词	Fixation point
释义	Fixation point 原声例句和Annemarie学职场英语 And that fixation point above the heads of your audience and toward the back of the room will help. 而将注意力集中在观众头顶和房间后部的位置将会有所帮助。英语百科 Focus (optics) In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle. This non-ideal focusing may be caused by aberrations of the imaging optics. In the absence of significant aberrations, the smallest possible blur circle is the Airy disc, which is caused by diffraction from the optical system's aperture. Aberrations tend to get worse as the aperture diameter increases, while the Airy circle is smallest for large apertures.
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Fixation point

Focus (optics)