what is lens?
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Heya Jenny
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, usually arranged along a common axis
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a curved piece of glass that makes things look bigger, clearer, etc. when you look through it. They are used in microscope, spectacles etc
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