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Focal point may refer to: Focus (optics) Focus (geometry) Conjugate points, also called focal points; Focal point (game theory) Unicom Focal Point, a portfolio management software tool; Focal point review, a human resources process for employee evaluation; Focal Point, a 1976 studio album by McCoy Tyner "Focal Point: Mark of the Leaf", a Naruto ...
A point of contact (POC) or single point of contact (SPOC) is a person or a department serving as the coordinator or focal point of information concerning an activity or program. A POC is used in many cases where information is time-sensitive and accuracy is important.
A principal focus or focal point is a special focus: For a lens , or a spherical or parabolic mirror , it is a point onto which collimated light parallel to the axis is focused. Since light can pass through a lens in either direction, a lens has two focal points – one on each side.
The rear focal length f ′ is the distance from the rear principal plane H ′ to the rear focal point F ′. Front focal distance (FFD) The front focal distance (FFD) (s F) is the distance from the front focal point of the system (F) to the vertex of the first optical surface (S 1). [1] [3] Some authors refer to this as "front focal length".
Lexically, chakra is the Indic reflex of an ancestral Indo-European form *kʷékʷlos, whence also "wheel" and "cycle" (Ancient Greek: κύκλος, romanized: kýklos). [10] [3] [4] It has both literal [11] and metaphorical uses, as in the "wheel of time" or "wheel of dharma", such as in Rigveda hymn verse 1.164.11, [12] [13] pervasive in the earliest Vedic texts.
A system is focal if an object ray parallel to the axis is conjugate to an image ray that intersects the optical axis. The intersection of the image ray with the optical axis is the focal point F ′ in image space. Focal systems also have an axial object point F such that any ray through F is conjugate to an image ray parallel to the optical axis.
A conic is defined as the locus of points for each of which the distance to the focus divided by the distance to the directrix is a fixed positive constant, called the eccentricity e. If 0 < e < 1 the conic is an ellipse, if e = 1 the conic is a parabola, and if e > 1 the conic is a hyperbola.
The reticle may be located at the front or rear focal plane (First Focal Plane (FFP) or Second Focal Plane (SFP)) [8] of the telescopic sight. On fixed power telescopic sights there is no significant difference, but on variable power telescopic sights the front plane reticle remains at a constant size compared to the target, while rear plane ...