Describe concave and convex lens ..
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Concave Lens - A concave lens is a type of lens that diverges a straight light beam coming from the source to a diminished, upright, virtual image is known as a concave lens . A concave lens is also known as diverging lens .
Convex Lens - A convex lens is a lens that converges rays of light that are traveling parallel to its principal axis . They can be identified by their shape which is thick across the middle and thin at the upper and lower edges . A convex lens is also known as a converging lens .
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