LENS FOOTBALL TICKETS
Lenses are used in a variety of imaging devices such as telescopes, binoculars and cameras.
They are also used as visual aids in glasses to correct vision defects such as nearsightedness and farsightedness.
The word "lens" comes from lēns, the Latin name for lentil, because a biconvex lens is shaped like a lentil.
Lentils also give the geometric shape its name.
Some scientists argue that archaeological evidence indicates widespread use of lenses in ancient times, spanning several millennia.
The so-called Nimrud lens is a rock crystal artifact dating from the 7th century BC that may or may not have been used as a magnifying glass or burning glass.
Others have suggested that some Egyptian hieroglyphs depict "simple glass meniscal lenses."
The oldest reliable reference to the use of lenses is in Aristophanes' play The Clouds, where burning glass is mentioned.
Pliny the Elder confirms that burning glasses were known as early as the Roman period.
Pliny also has the earliest known mention of the use of corrective lenses when he mentions that Nero was said to have watched gladiatorial games using an emerald.
Both Pliny and Seneca the Younger described the magnifying effect of a glass ball filled with water.