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11 relations: Angular diameter, Aperture, Diameter, F-number, Field of view, Focal length, Focus (optics), Lens (optics), Numerical aperture, Paraxial approximation, Refractive index.
Angular diameter
The angular diameter, angular size, apparent diameter, or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view.
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Aperture
In optics, an aperture is a hole or an opening through which light travels.
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Diameter
In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.
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F-number
The f-number of an optical system (such as a camera lens) is the ratio of the system's focal length to the diameter of the entrance pupil.
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Field of view
The field of view is the extent of the observable world that is seen at any given moment.
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Focal length
The focal length of an optical system is a measure of how strongly the system converges or diverges light.
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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.
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Lens (optics)
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.
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Numerical aperture
In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light.
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Paraxial approximation
In geometric optics, the paraxial approximation is a small-angle approximation used in Gaussian optics and ray tracing of light through an optical system (such as a lens).
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Refractive index
In optics, the refractive index or index of refraction of a material is a dimensionless number that describes how light propagates through that medium.
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