cylindrical lens - définition. Qu'est-ce que cylindrical lens
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Qu'est-ce (qui) est cylindrical lens - définition

Cylinder lens; Rod lens

Lens (hydrology)         
  • A freshwater lens on an island.
CONVEX LAYER OF FRESH GROUNDWATER THAT FLOATS ON TOP OF DENSER SALTWATER
User:Nsaum75/Lens (groundwater); User:Nsaum75/Lens (Hydrology); User:Nsaum75/Lens (hydrology); Lens (groundwater); Freshwater lens; Ghyben-Herzberg lenses; Ghyben–Herzberg lens; Ghyben-Herzberg lens; Ghyben/Herzberg lens; Groundwater lens
In hydrology, a lens, also called freshwater lens or Ghyben-Herzberg lens, is a convex-shaped layer of fresh groundwater that floats above the denser saltwater and is usually found on small coral or limestone islands and atolls. This aquifer of fresh water is recharged through precipitation that infiltrates the top layer of soil and percolates downward until it reaches the saturated zone.
Lens (plant)         
GENUS OF PLANTS
Lens (genus); Lentilla
Lens is a genus of flowering plant in the legume family mostly known for its edible seeds, which are referred to as lentils. Lens contains four species of small, erect or climbing herbs with pinnate leaves, small inconspicuous white flowers, and small flattened pods.
Toric lens         
  • When the major radius ''R'' approaches 0 (here from right to left), the torus becomes a sphere.
  • A torus results when a circle with [[radius]] ''r'' rotates around an axis lying in the same plane as the circle (here the ''z'' axis) at a distance ''R'' from the centre of the circle.
TYPE OF LENS
Sphero-cylindrical lens; Atoric lens
A toric lens is a lens with different optical power and focal length in two orientations perpendicular to each other. One of the lens surfaces is shaped like a "cap" from a torus (see figure at right), and the other one is usually spherical.

Wikipédia

Cylindrical lens

A cylindrical lens is a lens which focuses light into a line instead of a point, as a spherical lens would. The curved face or faces of a cylindrical lens are sections of a cylinder, and focus the image passing through it into a line parallel to intersection of the surface of the lens and a plane tangent to it along the cylinder's axis. The lens converges or diverges the image in the direction perpendicular to this line, and leaves it unaltered in the direction parallel to its cylinder's axis (in the tangent plane).

A toric lens combines the effect of a cylindrical lens with that of an ordinary spherical lens.