what is lens?distinguish between convex and concave lens ?
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Lens. A Lens is a type of mirror which refracts the light instead of reflection. Refraction is the bending of a light when it enters a medium. Here the medium is Lens. Lens are of various types but the two most important types are convex (on Bi-convex) and concave (or Bi-concave) lens.
Concave means "hollowed out or rounded inward" and is easily remembered because these surfaces "cave" in. The opposite is convex meaning "curved or rounded outward." Both words have been around for centuries but are often mixed up. Advice in mirror may be closer than it appears.
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