Define
1) concave lense
2) convex lense
write any one
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convex lens is a converging lens and concave lens is a diverging lens
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COCAVE LENSE : 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. ... Concave lenses have at least one surface curved inside.
CONVEX LENSE : An optical lens is generally made up of two spherical surfaces is called "CONCAVE LENSE"
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