What is a Lens? Explain both the lens with diagram.
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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 (elements), usually arranged along a common axis.
There are two main types of lenses, known as convex (or converging) and concave (or diverging)
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lesns is 2 type 1 convex 2 concave
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