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A collimated beam of light or other electromagnetic radiation has parallel rays, and therefore will spread minimally as it propagates. A laser beam is an archetypical example. A perfectly collimated light beam , with no divergence , would not disperse with distance.
Basalt columns seen on Porto Santo Island, Portugal. Columnar jointing of volcanic rocks exists in many places on Earth. Perhaps the most famous basalt lava flow in the world is the Giant's Causeway in Northern Ireland, in which the vertical joints form polygonal columns and give the impression of having been artificially constructed.
Beirut prospered during Roman and Byzantine times, until the earthquake of 551 AD destroyed the Roman city of Berytus. One of its most important streets was brought to light during the archaeological investigations of the souks site in the mid-1990s: a colonnaded shopping street with sidewalks, which connected the center to the Hippodrome of Berytus in Wadi Abu Jamil.
Columnar jointing in Giant's Causeway in Northern Ireland Columnar jointing in the Alcantara Gorge, Sicily. Columnar jointing is a geological structure where sets of intersecting closely spaced fractures, referred to as joints, result in the formation of a regular array of polygonal prisms (basalt prisms), or columns.
Example of a particle collimator. A collimator is a device which narrows a beam of particles or waves. To narrow can mean either to cause the directions of motion to become more aligned in a specific direction (i.e., make collimated light or parallel rays), or to cause the spatial cross section of the beam to become smaller (beam limiting device).
Collimated coherent light passing through two tubes with different refraction index gases, then an imaging lens creates the interferogram. Light from a source (left) is collimated by a lens and split into two beams using slits. The beams are sent through two different paths and pass through compensating plates.
The portico of the Croome Court in Croome D'Abitot (England) Temple diagram with location of the pronaos highlighted. A portico is a porch leading to the entrance of a building, or extended as a colonnade, with a roof structure over a walkway, supported by columns or enclosed by walls.
If a collimated beam is focused with a lens, the diameter of the beam in the rear focal plane of the lens is related to the divergence of the initial beam by =, where f is the focal length of the lens. [1]