what is a lens??????
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Lens: A lens is a piece of a refracting medium bounded by two surfaces, at least one of which is a curved surface. The commonly used lenses are the spherical lenses, which have either both surfaces spherical or one spherical and the other a plane one. ... It converges a parallel beam of light on refraction through it.
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a lens is a transmissive options optical device that focuses or distress a light beam by means reflection...
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