What is meant by LENSES?? explain his types
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A lens is a transmissive optical device that focuses or disperses light beams by means of refraction. A simple lens consists of a single piece of transparent material, while compound lenses consist of several simple lenses arranged along with a common
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The first king of all of England was Athelstan (895-939 AD) of the House of Wessex, grandson of Alfred the Great and 30th great-granduncle to Queen Elizabeth II. The Anglo-Saxon king defeated the last of the Viking invaders and consolidated Britain, ruling from 925-939 AD.
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