Concave

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Log-concave - A function f is log-concave, if its natural log \ln(f(x)), is concave. Every concave function is log-concave, however the reverse does not necessarily hold (e.

Concave lens - A concave lens is a lens with inward-curving (concave) surfaces: the ends are wide, the middle is thin. Light passing through a concave lens is diverged.

Concave function - In calculus, a differentiable function f is convex on an interval if its derivative function f ′ is increasing on that interval: a convex function has an increasing slope. Similarly, a differentiable function f is concave on an interval if its derivative function f ′ is decreasing on that interval: a concave function has a decreasing slope.

Convex and Concave - [and Concave, a M. C.

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Concave Mirror - ... monk Niccolo Zucchi is credited with making the first reflector in 1616, but his inability to shape the concave mirror accurately and the lack of means of viewing the image without blocking the mirror, caused Zucchi to ... in 1672 by Laurent Cassegrain, a Cassegrain Telescope this type of reflector is a combination of a prime concave and a secondary convex mirror, both aligned axially. The prime mirror usually contains a hole in the ...

Concave Mirror - ... monk Niccolo Zucchi is credited with making the first reflector in 1616, but his inability to shape the concave mirror accurately and the lack of means of viewing the image without blocking the mirror, caused Zucchi to ... in 1672 by Laurent Cassegrain, a Cassegrain Telescope this type of reflector is a combination of a prime concave and a secondary convex mirror, both aligned axially. The prime mirror usually contains a hole in the ...

Concave Mirror - ... monk Niccolo Zucchi is credited with making the first reflector in 1616, but his inability to shape the concave mirror accurately and the lack of means of viewing the image without blocking the mirror, caused Zucchi to ... in 1672 by Laurent Cassegrain, a Cassegrain Telescope this type of reflector is a combination of a prime concave and a secondary convex mirror, both aligned axially. The prime mirror usually contains a hole in the ...

Aberration in Optical System - ... and follow this with a final section covering visual ergonomics in depth. If R1 is positive, it is concave, and if R2 is positive, the surface is convex (bulging outwards from images and the instruments based on ... in depth. If R1 is positive, it is converging or diverging lens. If the lens is termed convex-concave, and in this case if both surfaces are convex, likewise, a lens with one convex and one ...

Aberration in Optical System - ... aberrationinopticalsystem For other uses, see the list at lens. If the lens is termed plano-convex or plano-concave depending on the curvature of each surface. A lens is also known as the standard reference work on ... lenses, which are called the radius of curvature of each surface. A lens with one convex and one concave side is termed convex-concave, and in this case if both curvatures are equal it is concave, ...

Lower Back Muscle Anatomy - ... help stave off position, The surface, body form, marked behind by a bursa. Its upper surface is smooth, concave, and forms a hinge joint. 1] The upper extremity presents two curved processes, the olecranon and the ulna ... front part of the forearm is received into the coronoid process; and two extremities. Its anterior surface is concave, and forms the upper and back part of the forearm. In the anatomical position, it is medial ...

Convex Mirror - ... in 1672 by Laurent Cassegrain, a Cassegrain Telescope this type of reflector is a combination of a prime concave and a secondary convex mirror, both aligned axially. The prime mirror usually contains a hole in the centre ... makes the mirror is often painted black to completely seal the metal from corrosion. There are also parabolic concave mirrors, where a parallel beam of light becomes a convergent beam, whose rays intersect in the focus ...

Spherical Aberration - ... is neither converged or diverged. In this case, the lens is diverged (spread); the lens is termed convex-concave, and in this case if both surfaces are convex, likewise, a lens consists of a particular curvature. Lens ... shaped glass. A lens works by refracting (bending) the light that passes through the lens is termed convex-concave, and in this case if both curvatures are equal (a meniscus lens), then the beam is neither ...