Politically, Ireland is divided between the Republic of Ireland (officially also named Ireland), which covers five-sixths of the island, and Northern Ireland, a part of the United Kingdom, which covers the remaining area and is located in the northeast of the island.orthern Ireland is a part of the United Kingdom with a local executive and assembly which exercise devolved powers. The executive is jointly headed by the first and deputy-first minister, with the ministries being allocated in proportion with each party's representation in the assembly. Its capital is Belfast.
Lens (optics) For other uses, see Lens. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.
lenses ground to rigid specifications. 6. Mechanics. of, relating to, or noting a body in which the distance between any pair of points remains fixed under all forces; having infinite values for its shear modulus, bulk modulus, and Young's modulus.